Renamed ConfigParser to configparser.

Renamed ConfigParser to configparser.
Merged revisions 63247-63248 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r63247 | georg.brandl | 2008-05-14 18:30:31 -0400 (Wed, 14 May 2008) | 2 lines

  Update configparser docs for lowercasing rename.
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  r63248 | alexandre.vassalotti | 2008-05-14 18:44:22 -0400 (Wed, 14 May 2008) | 8 lines

  Updated import statements to use the new `configparser` module name.
  Updated the documentation to use the new name.
  Revert addition of the stub entry for the old name.

  Georg, I am reverting your changes since this commit should propagate
  to py3k.
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