Merged revisions 63988,63991 via svnmerge from

Merged revisions 63988,63991 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r63988 | thomas.heller | 2008-06-06 20:37:55 +0200 (Fr, 06 Jun 2008) | 3 lines

  Performance improvement: Use PyDict_Get/SetItem instead of
  PyDict_Get/SetItemString.
........
  r63991 | thomas.heller | 2008-06-06 22:05:15 +0200 (Fr, 06 Jun 2008) | 5 lines

  Document the new ctypes features.

  It would be great if someone could review both sematics, markup, and
  spelling, and correct the versionadded and versionchanges markers.
........