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.
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 02a1b1d..1e91eef 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -27,8 +27,8 @@
 __version__ = "$Revision$"       # Code version
 
 from types import *
-from copy_reg import dispatch_table
-from copy_reg import _extension_registry, _inverted_registry, _extension_cache
+from copyreg import dispatch_table
+from copyreg import _extension_registry, _inverted_registry, _extension_cache
 import marshal
 import sys
 import struct
@@ -295,7 +295,7 @@
             self.save_global(obj)
             return
 
-        # Check copy_reg.dispatch_table
+        # Check copyreg.dispatch_table
         reduce = dispatch_table.get(t)
         if reduce:
             rv = reduce(obj)