ENH: add chained comparisons
ENH: add subscripting to eval expressions
ENH: added interpretation of 'in' in pytables Term syntax

which is syntactically equivalent of '='
TST: make sure py3.x behavior is expected
ENH: add local scoping with @lcl_variable syntax
ENH: add DataFrame.eval method and tests for local syntax
ENH: add in, not in, and string/list query support