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/Doc/library/persistence.rst b/Doc/library/persistence.rst
index 78e40f6..3708d17 100644
--- a/Doc/library/persistence.rst
+++ b/Doc/library/persistence.rst
@@ -19,7 +19,7 @@
 .. toctree::
 
    pickle.rst
-   copy_reg.rst
+   copyreg.rst
    shelve.rst
    marshal.rst
    anydbm.rst