[issue23699] Add a macro to ease writing rich comparisons

[Petr Viktorin]

Petr Viktorin added the comment:

Changed the macro to Py_RETURN_RICHCOMPARE. This is not an expression, allowing the use of a switch statement. On the other hand, it's even larger macro than before now.

>From the discussion it seems that doing this correctly is tricky to do this correctly - another point for standardizing this.

I put everything in a single macro to ease review in Rietveld.

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Added file: http://bugs.python.org/file38657/Use-a-macro-to-reduce-boilerplate-in-rich-comparison.patch

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