Simplified `SortedDict.__deepcopy__` now that the its constructor can take a sequence of tuples.
Simplified `SortedDict.__deepcopy__` now that the its constructor can take a sequence of tuples.

--HG--
extra : convert_revision : svn%3Abcc190cf-cafb-0310-a4f2-bffc1f526a37/django/trunk%406669

Belgabor/django,Belgabor/django,Belgabor/django