HMM: modificar flat prior por el el posterior del modelo preferido con full sample

[alfredo-sampron]

Esto implicaría eliminar

                if not "last_day_state_probs" in locals():
                    # this checks for failure of estimation in the first day
                    last_day_state_probs = np.full(nstate, (1 / nstate))
                    # inputs a flat prior if it has no previous day to fall back on```