[issue5630] Create alternatieve CObject API that is safe and clean

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

Whoopsie-daisy, I forgot to touch up a whole lot of places to match the
new API.  Attached is an updated patch; here's what changed:
* The documentation is now much better; there is a capsule.rst, and
cobject.rst has a deprecation warning.
* Added a deprecation warning in a comment to Include/cobject.h.
* Added the PyCapsule APIs to refcounts.dat and the .def files for OS/2
builds.
* Changed a commented mention of "CObject" to "Capsule" in
Lib/test/test_sys.py.

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Added file: http://bugs.python.org/file13706/lch.capsule.r71641.diff.2

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