Rename copy_reg module to copyreg.
Updated documentation.
Merged revisions 63042 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r63042 | alexandre.vassalotti | 2008-05-11 04:25:28 -0400 (Sun, 11 May 2008) | 5 lines

  Added module stub for copy_reg renaming in 3.0.
  Renamed copy_reg to copyreg in the standard library, to avoid
  spurious warnings and ease later merging to py3k branch. Public
  documentation remains intact.
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diff --git a/Modules/parsermodule.c b/Modules/parsermodule.c
index 497d4e6..ecd4b83 100644
--- a/Modules/parsermodule.c
+++ b/Modules/parsermodule.c
@@ -3091,7 +3091,7 @@
      * If this fails, the import of this module will fail because an
      * exception will be raised here; should we clear the exception?
      */
-    copyreg = PyImport_ImportModuleNoBlock("copy_reg");
+    copyreg = PyImport_ImportModuleNoBlock("copyreg");
     if (copyreg != NULL) {
         PyObject *func, *pickler;