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

[Florent Xicluna]

Changes by Florent Xicluna <laxyf at yahoo.fr>:


Removed file: http://bugs.python.org/file16150/issue7712_context_manager_v2.diff

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<http://bugs.python.org/issue7712>
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