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After more code review, added PyDict_Check.

Also, discussion on python-dev showed a need to rename 
the method to indicate that keys were being used rather 
than items.  The sequence part of the name was dropped 
because any iterable will do as an argument.

Checked-in as:
Misc/NEWS 1.548
Objects/dictobject.c 2.132
Lib/test/test_types.py 1.41
Doc/lib/libstdtypes.tex 1.111