Simplify save_snapshot() and load_snapshot() by removing the unnecessary double pickling of topo.sim (which had been done to allow setting of class attributes and execution of startup commands *before* the simulation was unpickled; that is not required).
Simplify save_snapshot() and load_snapshot() by removing the unnecessary double pickling of topo.sim (which had been done to allow setting of class attributes and execution of startup commands *before* the simulation was unpickled; that is not required).


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