ENH: add new computation module and toplevel eval function
BUG: prevent certain index types from joining with DatetimeIndex
ENH: rewrite assignment as equal comparison for PyTables
ENH: add Expr based terms for pytables
ENH: add automatic query via frame.__getitem__
ENH: add boolean operators
ENH: add chained comparisons
BUG: provide automagic scope updating

This avoids need to pass local_dict/globals_dict explicity to
query/frame.__getitem__/eval
TST: added same_name_scoping tests to io/tests/test_pytables.py
ENH: add subscripting to eval expressions
CLN/ENH: more reliable temporary variable mechanism
DOC: add doc examples for not and a more complex query
ENH: added interpretation of 'in' in pytables Term syntax

which is syntactically equivalent of '='
ENH: allow parsing of datetimes
CLN/ENH: add syntax check before name resolution attempt
ENH: ensure that resolvers do not overlap with current scope
BUG: numexpr < 2.1 needs to stringify (and not unicode) the expression to ne.evaluate
BLD: py3 compatibility fixes
CLN/ENH: pass engine and parser to recursive calls to eval
TST: make sure py3.x behavior is expected