[issue16991] Add OrderedDict written in C

[Eric Snow]

Eric Snow added the comment:

These are the leaks I'm seeing in test_collections (14/24 tests):

 test_copying         : 178
 test_iterators       : 40
 test_update          : 29
 test_init            : 22
 test_move_to_end     : 21
 test_sorted_iterators: 20
 test_setdefault      : 16
 test_clear           : 5
 test_setitem         : 5
 test_delitem         : 4
 test_repr_recursive  : 4
 test_repr            : 3
 test_override_update : 2
 test_reinsert        : 1

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<http://bugs.python.org/issue16991>
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