Merged revisions 79195,79425,79427,79450 via svnmerge from

Merged revisions 79195,79425,79427,79450 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r79195 | florent.xicluna | 2010-03-21 13:27:20 +0100 (dim, 21 mar 2010) | 2 lines

  Issue #8179: Fix macpath.realpath() on a non-existing path.
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  r79425 | florent.xicluna | 2010-03-25 21:32:07 +0100 (jeu, 25 mar 2010) | 2 lines

  Syntax cleanup `== None` -> `is None`
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  r79427 | florent.xicluna | 2010-03-25 21:39:10 +0100 (jeu, 25 mar 2010) | 2 lines

  Fix test_unittest and test_warnings when running "python -Werror -m test.regrtest"
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  r79450 | florent.xicluna | 2010-03-26 20:32:44 +0100 (ven, 26 mar 2010) | 2 lines

  Ensure that the failed or unexpected tests are sorted before printing.
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