[Python-3000] Removal of PyArg_Parse()

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    Guido> Are there any existing uses (in the core) that are hard to
    Guido> replace with PyArg_ParseTuple()?

There are lots of uses where the arguments aren't tuples.  I was
particularly vexed by the time module because it was used to extract
arguments both from tuples and from time.struct_time objects.

I suspect most of the low-hanging fruit (PyArg_Parse used to parse tuples)
has already been plucked.

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