Fix memory leak in dict_to_map(), SF bug [ #485152 ] memory leak in test_scope.

Fix memory leak in dict_to_map(), SF bug [ #485152 ] memory leak in test_scope.

PyCell_Set() incremenets the reference count, so the earlier XINCREF
causes a leak.

Also make a number of small performance improvements to the code on
the assumption that most of the time variables are not rebound across
a FastToLocals() / LocalsToFast() pair.

Replace uses of PyCell_Set() and PyCell_Get() with PyCell_SET() and
PyCell_GET(), since the frame is guaranteed to contain cells.