Added (inverse) Fisher information calculations for nonstationary model.
Added (inverse) Fisher information calculations for nonstationary model.

othercriteria/StochasticBlockmodel,othercriteria/StochasticBlockmodel,othercriteria/StochasticBlockmodel,othercriteria/StochasticBlockmodel,othercriteria/StochasticBlockmodel,othercriteria/StochasticBlockmodel