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diff --git a/contexts/data/lib/closure-library/closure/goog/structs/avltree.js b/contexts/data/lib/closure-library/closure/goog/structs/avltree.js
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index 99ec95f..0000000
--- a/contexts/data/lib/closure-library/closure/goog/structs/avltree.js
+++ /dev/null
@@ -1,776 +0,0 @@
-// Copyright 2007 The Closure Library Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-/**
- * @fileoverview Datastructure: AvlTree.
- *
- *
- * This file provides the implementation of an AVL-Tree datastructure. The tree
- * maintains a set of unique values in a sorted order. The values can be
- * accessed efficiently in their sorted order since the tree enforces an O(logn)
- * maximum height. See http://en.wikipedia.org/wiki/Avl_tree for more detail.
- *
- * The big-O notation for all operations are below:
- * <pre>
- *   Method                 big-O
- * ----------------------------------------------------------------------------
- * - add                    O(logn)
- * - remove                 O(logn)
- * - clear                  O(1)
- * - contains               O(logn)
- * - getCount               O(1)
- * - getMinimum             O(1), or O(logn) when optional root is specified
- * - getMaximum             O(1), or O(logn) when optional root is specified
- * - getHeight              O(1)
- * - getValues              O(n)
- * - inOrderTraverse        O(logn + k), where k is number of traversed nodes
- * - reverseOrderTraverse   O(logn + k), where k is number of traversed nodes
- * </pre>
- */
-
-
-goog.provide('goog.structs.AvlTree');
-goog.provide('goog.structs.AvlTree.Node');
-
-goog.require('goog.structs');
-goog.require('goog.structs.Collection');
-
-
-
-/**
- * Constructs an AVL-Tree, which uses the specified comparator to order its
- * values. The values can be accessed efficiently in their sorted order since
- * the tree enforces a O(logn) maximum height.
- *
- * @param {Function=} opt_comparator Function used to order the tree's nodes.
- * @constructor
- * @implements {goog.structs.Collection}
- */
-goog.structs.AvlTree = function(opt_comparator) {
-  this.comparator_ = opt_comparator ||
-                     goog.structs.AvlTree.DEFAULT_COMPARATOR_;
-};
-
-
-/**
- * String comparison function used to compare values in the tree. This function
- * is used by default if no comparator is specified in the tree's constructor.
- *
- * @param {string} a The first string.
- * @param {string} b The second string.
- * @return {number} -1 if a < b, 1 if a > b, 0 if a = b.
- * @private
- */
-goog.structs.AvlTree.DEFAULT_COMPARATOR_ = function(a, b) {
-  if (String(a) < String(b)) {
-    return -1;
-  } else if (String(a) > String(b)) {
-    return 1;
-  }
-  return 0;
-};
-
-
-/**
- * Pointer to the root node of the tree.
- *
- * @type {goog.structs.AvlTree.Node}
- * @private
- */
-goog.structs.AvlTree.prototype.root_ = null;
-
-
-/**
- * Comparison function used to compare values in the tree. This function should
- * take two values, a and b, and return x where:
- * <pre>
- *  x < 0 if a < b,
- *  x > 0 if a > b,
- *  x = 0 otherwise
- * </pre>
- *
- * @type {Function}
- * @private
- */
-goog.structs.AvlTree.prototype.comparator_ = null;
-
-
-/**
- * Pointer to the node with the smallest value in the tree.
- *
- * @type {goog.structs.AvlTree.Node}
- * @private
- */
-goog.structs.AvlTree.prototype.minNode_ = null;
-
-
-/**
- * Pointer to the node with the largest value in the tree.
- *
- * @type {goog.structs.AvlTree.Node}
- * @private
- */
-goog.structs.AvlTree.prototype.maxNode_ = null;
-
-
-/**
- * Keeps track of the number of nodes in the tree.
- *
- * @type {number}
- * @private
- */
-goog.structs.AvlTree.prototype.count_ = 0;
-
-
-/**
- * Inserts a node into the tree with the specified value if the tree does
- * not already contain a node with the specified value. If the value is
- * inserted, the tree is balanced to enforce the AVL-Tree height property.
- *
- * @param {*} value Value to insert into the tree.
- * @return {boolean} Whether value was inserted into the tree.
- * @override
- */
-goog.structs.AvlTree.prototype.add = function(value) {
-  // If the tree is empty, create a root node with the specified value
-  if (this.root_ == null) {
-    this.root_ = new goog.structs.AvlTree.Node(value);
-    this.minNode_ = this.root_;
-    this.maxNode_ = this.root_;
-    this.count_ = 1;
-    return true;
-  }
-
-  // Assume a node is not added and change status when one is
-  var retStatus = false;
-
-  // Depth traverse the tree and insert the value if we reach a null node
-  this.traverse_(function(node) {
-    var retNode = null;
-    if (this.comparator_(node.value, value) > 0) {
-      retNode = node.left;
-      if (node.left == null) {
-        var newNode = new goog.structs.AvlTree.Node(value, node);
-        node.left = newNode;
-        if (node == this.minNode_) {
-          this.minNode_ = newNode;
-        }
-        retStatus = true; // Value was added to tree
-        this.balance_(node); // Maintain the AVL-tree balance
-      }
-    } else if (this.comparator_(node.value, value) < 0) {
-      retNode = node.right;
-      if (node.right == null) {
-        var newNode = new goog.structs.AvlTree.Node(value, node);
-        node.right = newNode;
-        if (node == this.maxNode_) {
-          this.maxNode_ = newNode;
-        }
-        retStatus = true; // Value was added to tree
-        this.balance_(node); // Maintain the AVL-tree balance
-      }
-    }
-    return retNode; // If null, we'll stop traversing the tree
-  });
-
-  // If a node was added, increment count
-  if (retStatus) {
-    this.count_ += 1;
-  }
-
-  // Return true if a node was added, false otherwise
-  return retStatus;
-};
-
-
-/**
- * Removes a node from the tree with the specified value if the tree contains a
- * node with this value. If a node is removed the tree is balanced to enforce
- * the AVL-Tree height property. The value of the removed node is returned.
- *
- * @param {*} value Value to find and remove from the tree.
- * @return {*} The value of the removed node or null if the value was not in
- *     the tree.
- * @override
- */
-goog.structs.AvlTree.prototype.remove = function(value) {
-  // Assume the value is not removed and set the value when it is removed
-  var retValue = null;
-
-  // Depth traverse the tree and remove the value if we find it
-  this.traverse_(function(node) {
-    var retNode = null;
-    if (this.comparator_(node.value, value) > 0) {
-      retNode = node.left;
-    } else if (this.comparator_(node.value, value) < 0) {
-      retNode = node.right;
-    } else {
-      retValue = node.value;
-      this.removeNode_(node);
-    }
-    return retNode; // If null, we'll stop traversing the tree
-  });
-
-  // If a node was removed, decrement count.
-  if (retValue) {
-    // Had traverse_() cleared the tree, set to 0.
-    this.count_ = this.root_ ? this.count_ - 1 : 0;
-  }
-
-  // Return the value that was removed, null if the value was not in the tree
-  return retValue;
-};
-
-
-/**
- * Removes all nodes from the tree.
- */
-goog.structs.AvlTree.prototype.clear = function() {
-  this.root_ = null;
-  this.minNode_ = null;
-  this.maxNode_ = null;
-  this.count_ = 0;
-};
-
-
-/**
- * Returns true if the tree contains a node with the specified value, false
- * otherwise.
- *
- * @param {*} value Value to find in the tree.
- * @return {boolean} Whether the tree contains a node with the specified value.
- * @override
- */
-goog.structs.AvlTree.prototype.contains = function(value) {
-  // Assume the value is not in the tree and set this value if it is found
-  var isContained = false;
-
-  // Depth traverse the tree and set isContained if we find the node
-  this.traverse_(function(node) {
-    var retNode = null;
-    if (this.comparator_(node.value, value) > 0) {
-      retNode = node.left;
-    } else if (this.comparator_(node.value, value) < 0) {
-      retNode = node.right;
-    } else {
-      isContained = true;
-    }
-    return retNode; // If null, we'll stop traversing the tree
-  });
-
-  // Return true if the value is contained in the tree, false otherwise
-  return isContained;
-};
-
-
-/**
- * Returns the number of values stored in the tree.
- *
- * @return {number} The number of values stored in the tree.
- * @override
- */
-goog.structs.AvlTree.prototype.getCount = function() {
-  return this.count_;
-};
-
-
-/**
- * Returns the value u, such that u is contained in the tree and u < v, for all
- * values v in the tree where v != u.
- *
- * @return {*} The minimum value contained in the tree.
- */
-goog.structs.AvlTree.prototype.getMinimum = function() {
-  return this.getMinNode_().value;
-};
-
-
-/**
- * Returns the value u, such that u is contained in the tree and u > v, for all
- * values v in the tree where v != u.
- *
- * @return {*} The maximum value contained in the tree.
- */
-goog.structs.AvlTree.prototype.getMaximum = function() {
-  return this.getMaxNode_().value;
-};
-
-
-/**
- * Returns the height of the tree (the maximum depth). This height should
- * always be <= 1.4405*(Math.log(n+2)/Math.log(2))-1.3277, where n is the
- * number of nodes in the tree.
- *
- * @return {number} The height of the tree.
- */
-goog.structs.AvlTree.prototype.getHeight = function() {
-  return this.root_ ? this.root_.height : 0;
-};
-
-
-/**
- * Inserts the values stored in the tree into a new Array and returns the Array.
- *
- * @return {Array} An array containing all of the trees values in sorted order.
- */
-goog.structs.AvlTree.prototype.getValues = function() {
-  var ret = [];
-  this.inOrderTraverse(function(value) {
-    ret.push(value);
-  });
-  return ret;
-};
-
-
-/**
- * Performs an in-order traversal of the tree and calls {@code func} with each
- * traversed node, optionally starting from the smallest node with a value >= to
- * the specified start value. The traversal ends after traversing the tree's
- * maximum node or when {@code func} returns a value that evaluates to true.
- *
- * @param {Function} func Function to call on each traversed node.
- * @param {Object=} opt_startValue If specified, traversal will begin on the
- *    node with the smallest value >= opt_startValue.
- */
-goog.structs.AvlTree.prototype.inOrderTraverse =
-    function(func, opt_startValue) {
-  // If our tree is empty, return immediately
-  if (!this.root_) {
-    return;
-  }
-
-  // Depth traverse the tree to find node to begin in-order traversal from
-  var startNode;
-  if (opt_startValue) {
-    this.traverse_(function(node) {
-      var retNode = null;
-      if (this.comparator_(node.value, opt_startValue) > 0) {
-        retNode = node.left;
-        startNode = node;
-      } else if (this.comparator_(node.value, opt_startValue) < 0) {
-        retNode = node.right;
-      } else {
-        startNode = node;
-      }
-      return retNode; // If null, we'll stop traversing the tree
-    });
-  } else {
-    startNode = this.getMinNode_();
-  }
-
-  // Traverse the tree and call func on each traversed node's value
-  var node = startNode, prev = startNode.left ? startNode.left : startNode;
-  while (node != null) {
-    if (node.left != null && node.left != prev && node.right != prev) {
-      node = node.left;
-    } else {
-      if (node.right != prev) {
-        if (func(node.value)) {
-          return;
-        }
-      }
-      var temp = node;
-      node = node.right != null && node.right != prev ?
-             node.right :
-             node.parent;
-      prev = temp;
-    }
-  }
-};
-
-
-/**
- * Performs a reverse-order traversal of the tree and calls {@code func} with
- * each traversed node, optionally starting from the largest node with a value
- * <= to the specified start value. The traversal ends after traversing the
- * tree's minimum node or when func returns a value that evaluates to true.
- *
- * @param {Function} func Function to call on each traversed node.
- * @param {Object=} opt_startValue If specified, traversal will begin on the
- *    node with the largest value <= opt_startValue.
- */
-goog.structs.AvlTree.prototype.reverseOrderTraverse =
-    function(func, opt_startValue) {
-  // If our tree is empty, return immediately
-  if (!this.root_) {
-    return;
-  }
-
-  // Depth traverse the tree to find node to begin reverse-order traversal from
-  var startNode;
-  if (opt_startValue) {
-    this.traverse_(goog.bind(function(node) {
-      var retNode = null;
-      if (this.comparator_(node.value, opt_startValue) > 0) {
-        retNode = node.left;
-      } else if (this.comparator_(node.value, opt_startValue) < 0) {
-        retNode = node.right;
-        startNode = node;
-      } else {
-        startNode = node;
-      }
-      return retNode; // If null, we'll stop traversing the tree
-    }, this));
-  } else {
-    startNode = this.getMaxNode_();
-  }
-
-  // Traverse the tree and call func on each traversed node's value
-  var node = startNode, prev = startNode.right ? startNode.right : startNode;
-  while (node != null) {
-    if (node.right != null && node.right != prev && node.left != prev) {
-      node = node.right;
-    } else {
-      if (node.left != prev) {
-        if (func(node.value)) {
-          return;
-        }
-      }
-      var temp = node;
-      node = node.left != null && node.left != prev ?
-             node.left :
-             node.parent;
-      prev = temp;
-    }
-  }
-};
-
-
-/**
- * Performs a traversal defined by the supplied {@code traversalFunc}. The first
- * call to {@code traversalFunc} is passed the root or the optionally specified
- * startNode. After that, calls {@code traversalFunc} with the node returned
- * by the previous call to {@code traversalFunc} until {@code traversalFunc}
- * returns null or the optionally specified endNode. The first call to
- * traversalFunc is passed the root or the optionally specified startNode.
- *
- * @param {Function} traversalFunc Function used to traverse the tree. Takes a
- *     node as a parameter and returns a node.
- * @param {goog.structs.AvlTree.Node=} opt_startNode The node at which the
- *     traversal begins.
- * @param {goog.structs.AvlTree.Node=} opt_endNode The node at which the
- *     traversal ends.
- * @private
- */
-goog.structs.AvlTree.prototype.traverse_ =
-    function(traversalFunc, opt_startNode, opt_endNode) {
-  var node = opt_startNode ? opt_startNode : this.root_;
-  var endNode = opt_endNode ? opt_endNode : null;
-  while (node && node != endNode) {
-    node = traversalFunc.call(this, node);
-  }
-};
-
-
-/**
- * Ensures that the specified node and all its ancestors are balanced. If they
- * are not, performs left and right tree rotations to achieve a balanced
- * tree. This method assumes that at most 2 rotations are necessary to balance
- * the tree (which is true for AVL-trees that are balanced after each node is
- * added or removed).
- *
- * @param {goog.structs.AvlTree.Node} node Node to begin balance from.
- * @private
- */
-goog.structs.AvlTree.prototype.balance_ = function(node) {
-
-  this.traverse_(function(node) {
-    // Calculate the left and right node's heights
-    var lh = node.left ? node.left.height : 0;
-    var rh = node.right ? node.right.height : 0;
-
-    // Rotate tree rooted at this node if it is not AVL-tree balanced
-    if (lh - rh > 1) {
-      if (node.left.right && (!node.left.left ||
-          node.left.left.height < node.left.right.height)) {
-        this.leftRotate_(node.left);
-      }
-      this.rightRotate_(node);
-    } else if (rh - lh > 1) {
-      if (node.right.left && (!node.right.right ||
-          node.right.right.height < node.right.left.height)) {
-        this.rightRotate_(node.right);
-      }
-      this.leftRotate_(node);
-    }
-
-    // Recalculate the left and right node's heights
-    lh = node.left ? node.left.height : 0;
-    rh = node.right ? node.right.height : 0;
-
-    // Set this node's height
-    node.height = Math.max(lh, rh) + 1;
-
-    // Traverse up tree and balance parent
-    return node.parent;
-  }, node);
-
-};
-
-
-/**
- * Performs a left tree rotation on the specified node.
- *
- * @param {goog.structs.AvlTree.Node} node Pivot node to rotate from.
- * @private
- */
-goog.structs.AvlTree.prototype.leftRotate_ = function(node) {
-  // Re-assign parent-child references for the parent of the node being removed
-  if (node.isLeftChild()) {
-    node.parent.left = node.right;
-    node.right.parent = node.parent;
-  } else if (node.isRightChild()) {
-    node.parent.right = node.right;
-    node.right.parent = node.parent;
-  } else {
-    this.root_ = node.right;
-    this.root_.parent = null;
-  }
-
-  // Re-assign parent-child references for the child of the node being removed
-  var temp = node.right;
-  node.right = node.right.left;
-  if (node.right != null) node.right.parent = node;
-  temp.left = node;
-  node.parent = temp;
-};
-
-
-/**
- * Performs a right tree rotation on the specified node.
- *
- * @param {goog.structs.AvlTree.Node} node Pivot node to rotate from.
- * @private
- */
-goog.structs.AvlTree.prototype.rightRotate_ = function(node) {
-  // Re-assign parent-child references for the parent of the node being removed
-  if (node.isLeftChild()) {
-    node.parent.left = node.left;
-    node.left.parent = node.parent;
-  } else if (node.isRightChild()) {
-    node.parent.right = node.left;
-    node.left.parent = node.parent;
-  } else {
-    this.root_ = node.left;
-    this.root_.parent = null;
-  }
-
-  // Re-assign parent-child references for the child of the node being removed
-  var temp = node.left;
-  node.left = node.left.right;
-  if (node.left != null) node.left.parent = node;
-  temp.right = node;
-  node.parent = temp;
-};
-
-
-/**
- * Removes the specified node from the tree and ensures the tree still
- * maintains the AVL-tree balance.
- *
- * @param {goog.structs.AvlTree.Node} node The node to be removed.
- * @private
- */
-goog.structs.AvlTree.prototype.removeNode_ = function(node) {
-  // Perform normal binary tree node removal, but balance the tree, starting
-  // from where we removed the node
-  if (node.left != null || node.right != null) {
-    var b = null; // Node to begin balance from
-    var r;        // Node to replace the node being removed
-    if (node.left != null) {
-      r = this.getMaxNode_(node.left);
-      if (r != node.left) {
-        r.parent.right = r.left;
-        if (r.left) r.left.parent = r.parent;
-        r.left = node.left;
-        r.left.parent = r;
-        b = r.parent;
-      }
-      r.parent = node.parent;
-      r.right = node.right;
-      if (r.right) r.right.parent = r;
-      if (node == this.maxNode_) this.maxNode_ = r;
-    } else {
-      r = this.getMinNode_(node.right);
-      if (r != node.right) {
-        r.parent.left = r.right;
-        if (r.right) r.right.parent = r.parent;
-        r.right = node.right;
-        r.right.parent = r;
-        b = r.parent;
-      }
-      r.parent = node.parent;
-      r.left = node.left;
-      if (r.left) r.left.parent = r;
-      if (node == this.minNode_) this.minNode_ = r;
-    }
-
-    // Update the parent of the node being removed to point to its replace
-    if (node.isLeftChild()) {
-      node.parent.left = r;
-    } else if (node.isRightChild()) {
-      node.parent.right = r;
-    } else {
-      this.root_ = r;
-    }
-
-    // Balance the tree
-    this.balance_(b ? b : r);
-  } else {
-    // If the node is a leaf, remove it and balance starting from its parent
-    if (node.isLeftChild()) {
-      this.special = 1;
-      node.parent.left = null;
-      if (node == this.minNode_) this.minNode_ = node.parent;
-      this.balance_(node.parent);
-    } else if (node.isRightChild()) {
-      node.parent.right = null;
-      if (node == this.maxNode_) this.maxNode_ = node.parent;
-      this.balance_(node.parent);
-    } else {
-      this.clear();
-    }
-  }
-};
-
-
-/**
- * Returns the node with the smallest value in tree, optionally rooted at
- * {@code opt_rootNode}.
- *
- * @param {goog.structs.AvlTree.Node=} opt_rootNode Optional root node.
- * @return {goog.structs.AvlTree.Node} The node with the smallest value in
- *     the tree.
- * @private
- */
-goog.structs.AvlTree.prototype.getMinNode_ = function(opt_rootNode) {
-  if (!opt_rootNode) {
-    return this.minNode_;
-  }
-
-  var minNode = opt_rootNode;
-  this.traverse_(function(node) {
-    var retNode = null;
-    if (node.left) {
-      minNode = node.left;
-      retNode = node.left;
-    }
-    return retNode; // If null, we'll stop traversing the tree
-  }, opt_rootNode);
-
-  return minNode;
-};
-
-
-/**
- * Returns the node with the largest value in tree, optionally rooted at
- * opt_rootNode.
- *
- * @param {goog.structs.AvlTree.Node=} opt_rootNode Optional root node.
- * @return {goog.structs.AvlTree.Node} The node with the largest value in
- *     the tree.
- * @private
- */
-goog.structs.AvlTree.prototype.getMaxNode_ = function(opt_rootNode) {
-  if (!opt_rootNode) {
-    return this.maxNode_;
-  }
-
-  var maxNode = opt_rootNode;
-  this.traverse_(function(node) {
-    var retNode = null;
-    if (node.right) {
-      maxNode = node.right;
-      retNode = node.right;
-    }
-    return retNode; // If null, we'll stop traversing the tree
-  }, opt_rootNode);
-
-  return maxNode;
-};
-
-
-
-/**
- * Constructs an AVL-Tree node with the specified value. If no parent is
- * specified, the node's parent is assumed to be null. The node's height
- * defaults to 1 and its children default to null.
- *
- * @param {*} value Value to store in the node.
- * @param {goog.structs.AvlTree.Node=} opt_parent Optional parent node.
- * @constructor
- */
-goog.structs.AvlTree.Node = function(value, opt_parent) {
-  /**
-   * The value stored by the node.
-   *
-   * @type {*}
-   */
-  this.value = value;
-
-  /**
-   * The node's parent. Null if the node is the root.
-   *
-   * @type {goog.structs.AvlTree.Node}
-   */
-  this.parent = opt_parent ? opt_parent : null;
-};
-
-
-/**
- * The node's left child. Null if the node does not have a left child.
- *
- * @type {goog.structs.AvlTree.Node?}
- */
-goog.structs.AvlTree.Node.prototype.left = null;
-
-
-/**
- * The node's right child. Null if the node does not have a right child.
- *
- * @type {goog.structs.AvlTree.Node?}
- */
-goog.structs.AvlTree.Node.prototype.right = null;
-
-
-/**
- * The height of the tree rooted at this node.
- *
- * @type {number}
- */
-goog.structs.AvlTree.Node.prototype.height = 1;
-
-
-/**
- * Returns true iff the specified node has a parent and is the right child of
- * its parent.
- *
- * @return {boolean} Whether the specified node has a parent and is the right
- *    child of its parent.
- */
-goog.structs.AvlTree.Node.prototype.isRightChild = function() {
-  return !!this.parent && this.parent.right == this;
-};
-
-
-/**
- * Returns true iff the specified node has a parent and is the left child of
- * its parent.
- *
- * @return {boolean} Whether the specified node has a parent and is the left
- *    child of its parent.
- */
-goog.structs.AvlTree.Node.prototype.isLeftChild = function() {
-  return !!this.parent && this.parent.left == this;
-};