Merged revisions 73079 via svnmerge from

Merged revisions 73079 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r73079 | r.david.murray | 2009-05-31 15:44:27 -0400 (Sun, 31 May 2009) | 11 lines

  Merged revisions 73077 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r73077 | r.david.murray | 2009-05-31 15:15:57 -0400 (Sun, 31 May 2009) | 4 lines

    Issue 3848: document the fact that epoll register raises an IOError if
    an fd is registered twice, and add some additional epoll tests.  Patch
    by Christian Heimes.
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