[issue7989] Add pure Python implementation of datetime module to CPython

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

> - I find the _cmp() and __cmp() indirection poor style in 3.x,
> especially when you simply end up comparing self._getstate() and
> other._getstate() (it is also suboptimal because it can do more
> comparisons than needed)

The best I could come up with is issue7989-cmp.diff - basically replacing _cmp(self, other) with _normalize(self, other) that returns a pair of objects that compare the same as self and other.

I am not committing this in sandbox because I don't see this a big improvement.

Datetime comparisons are tricky due to date/datetime inheritance.  I think it is best not to touch it.

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Added file: http://bugs.python.org/file17842/issue7989-cmp.diff

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