[issue26516] Add PYTHONMALLOC env var and add support for malloc debug hooks in release mode

[STINNER Victor]

STINNER Victor added the comment:

More complete patch (version 2):

* Document PYTHONMALLOC environment variable
* Add PYTHONMALLOC=debug to install debug hooks without forcing a specific memory allocator (keep the default memory allocator)
* Fix sys._debugmallocstats() for PYTHONMALLOC=malloc: don't display pymalloc stats
* _testcapi.pymem_api_misuse(): more realistic code, use PyMem_Mallloc() + PyMem_RawFree(). This code works in release mode (since PyMem and PyMem_Raw use the same allocator: malloc/free), but fail with a fatal error with debug hooks (API misused).

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Added file: http://bugs.python.org/file42102/pymem-2.patch

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<http://bugs.python.org/issue26516>
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