When the _iter_mixin stopped inheritting from UsserDictMixin, it lost the

__repr__ which caused bsddb.test.test_misc.py to fail in test03_repr_closed_db
Restore the repr so the test passes.  I think this is correct, but it would
be good to have some more review.

Lib/bsddb/__init__.py

@@ -170,6 +170,9 @@ class _DBWithCursor(_iter_mixin):
     def __del__(self):
         self.close()
 
+    def __repr__(self):
+        return repr(dict(self.iteritems()))
+
     def _checkCursor(self):
         if self.dbc is None:
             self.dbc = _DeadlockWrap(self.db.cursor)