[issue23699] Add a macro to ease writing rich comparisons

[Petr Viktorin]

Petr Viktorin added the comment:

Attaching another patch:

- Leave _decimal alone per maintainer's wishes
- Fixes issues pointed out in the review
- Use Py_RICHCOMPARE also in _tkinter
- More improvements in the other affected modules

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Added file: http://bugs.python.org/file38605/0002-Use-Py_RICHCOMPARE-in-rich-comparisons.patch

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<http://bugs.python.org/issue23699>
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