[issue18492] Add test.support.regrtest_run flag, simplify support.requires

[R. David Murray]

R. David Murray added the comment:

Since we only use unittest for running subsets of our test suite, I think the better behavior is to run everything that -u all normally runs. That is, when one uses unittest to run a bit of the test suite, one generally wants to run the tests one specifies, not have them skipped.

Obviously this is open to discussion, however ;)

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<http://bugs.python.org/issue18492>
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