[Python-3000] Removal of PyArg_Parse()

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    Martin> As for the case of timemodule: the surprising feature is that
    Martin> "(ii)" uses PySequence_Getitem to access the fields, whereas
    Martin> PyArg_ParseTuple uses PyTuple_GET_ITEM, so it won't work for
    Martin> StructSequences.

I believe I've already fixed this (r57416) by inserting an intermediate
function to convert time.struct_time objects to tuples before
PyArgParseTuple sees them.  It would be nice if someone could take a minute
or two and review that change.

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