Merged revisions 80594 via svnmerge from

Merged revisions 80594 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r80594 | antoine.pitrou | 2010-04-28 21:59:32 +0200 (mer., 28 avril 2010) | 14 lines

  Merged revisions 80591-80592 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r80591 | antoine.pitrou | 2010-04-28 21:53:35 +0200 (mer., 28 avril 2010) | 4 lines

    State clearly that truncate() doesn't move the file position,
    and remove a duplicate of its specification.
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    r80592 | antoine.pitrou | 2010-04-28 21:57:33 +0200 (mer., 28 avril 2010) | 3 lines

    Clarify and fix the documentation for IOBase.close()
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