Merged revisions 73695,73711 via svnmerge from

Merged revisions 73695,73711 via svnmerge from
svn+ssh://svn.python.org/python/branches/py3k

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  r73695 | raymond.hettinger | 2009-06-29 20:30:43 +0200 (Mo, 29 Jun 2009) | 1 line

  Issue 6370: Performance issue with collections.Counter().
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  r73711 | benjamin.peterson | 2009-07-01 00:27:25 +0200 (Mi, 01 Jul 2009) | 9 lines

  Merged revisions 73710 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r73710 | benjamin.peterson | 2009-06-30 17:14:33 -0500 (Tue, 30 Jun 2009) | 1 line

    provide a dummy __exit__ on windows
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