restore RNG state after generating random numbers #353
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For generating datasets from PSID simulations it is useful to rely on a seed and random number generator to randomly select a perturbation. Currently, it is not possible to evaluate the same set of randomly selected perturbations for systems of different size (# of states) because of the call to the random number generator within a PSID simulation. This PR will reset the state of the random number generator so the state is not changed during a simulation.