reviewed vcache for use by git-annex; found it wanting

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+[[!comment format=mdwn
+ username="joey"
+ subject="""vache"""
+ date="2015-02-15T16:35:12Z"
+ content="""
+<https://github.com/dmbarbour/haskell-vcache>
+
+It uses LMDB, which is a C library, and its PVar is a variable named by a
+bytestring, so it's essentially a key/value store where the values can be
+arbitrary Haskell data types. Since git-annex already has Keys, and most
+of the need for the database is to look up some cached value for a Key,
+this seems like a pretty good fit!
+
+Unfortunately, "A VCache file may be opened by only one process at a time,
+and only once within said process."
+
+But, git-annex needs multiple read-only access, as many git-annex processes
+can run concurrently.
+"""]]