[issue7712] Add a context manager to change cwd in test.test_support and run the test suite in a temp dir.

[Florent Xicluna]

Florent Xicluna <laxyf at yahoo.fr> added the comment:

Fixed on trunk with r78136.

Before closing this issue, we may apply additional cleanup on regrtest:
 - the "sys.path" hack is not needed anymore (no risk of relative imports)
 - the hack for sys.argv[0] could be removed too, and use __file__ instead

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Added file: http://bugs.python.org/file16218/issue7712_regrtest_remove_hacks.diff

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