Fixed long-standing bug in PickleMain that was preventing Topographica simulations from being pickled using pickle (rather than cPickle, the default). Also made minor simplification to pickle.Pickler method calls (should have no effect).
Fixed long-standing bug in PickleMain that was preventing Topographica simulations from being pickled using pickle (rather than cPickle, the default). Also made minor simplification to pickle.Pickler method calls (should have no effect).

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