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ENH: permutation is consistent across StanFit instances

StanFit
 - Permutations are consistent across StanFit instances. This works
   by storing Matlab's RNG state at the time of construction
 - TestBernoulli is updated to check this
 - print() method now accepts 'sig_figs' parameter

StanModel
 - compile() checks stanc exit value and prints error.