ENH: add new computation module and toplevel eval function
ENH: rewrite assignment operator 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
ENH: add subscripting to eval expressions
ENH: added interpretation of 'in' in pytables Term syntax

which is syntactically equivalent of '='
ENH: add local scoping with @lcl_variable syntax
ENH: add DataFrame.eval method
ENH: add in, not in, and string/list query support
DOC: add perf blurb