[issue22955] Pickling of methodcaller, attrgetter, and itemgetter

[Zachary Ware]

Zachary Ware added the comment:

I'd prefer to just reimplement itemgetter and attrgetter to make them picklable rather than adding pickling methods to them; see attached patch.

I also posted a few comments, but I just went ahead and addressed them myself in this patch.  I'm not qualified to give the _operator.c changes a proper review, but they look good enough to me if others agree that __reduce__ is the best approach in C.

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Added file: http://bugs.python.org/file37319/issue22955.diff

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