[issue25220] Enhance and refactor test.regrtest (convert regrtest.py to a package)

[STINNER Victor]

STINNER Victor added the comment:

test_regrtest.patch: add tests for the 8 (!) ways to run the Python test suite.

TODO:
* try test on Windows
* maybe test also PCbuild/rt.bat on Windows

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Added file: http://bugs.python.org/file40596/test_regrtest.patch

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