Dafny:

* fixed parsing problem with a block ending a block
* replaced AssignStmt and "call" statements with UpdateStmt's
* fixed some minor printing problems
* changed implementation to check for ghost expressions in a pass separate from ResolveExpr
To-dos:
* compile and translate multi-assignments
* handle non-identifier LHSs of call statements
* change "var" statements in a similar way
* tighten up parsing of LHSs to allow only things like SelectExpr
* code and grammar clean-up to remove unused parts (e.g., "call" grammar productions and the "allowGhostFeatures" parameters)
* include the commented-out precondition of TrAssignment
* check in changes to the test suite

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