Updates:
        Status: NeedsDecision

Comment #1 on issue 2855 by pr...@goodok.ru: Move preordering of 'arg' from Add.flatten to Add._hashable_content.
http://code.google.com/p/sympy/issues/detail?id=2855

See:
https://github.com/sympy/sympy/pull/722

Some tests raise a questions, which I comment about in the discussion section of pull request (Now I changed them to be not fails, but I suppose that a few ones are wrong in the master version too)

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