Provide meaningful error message if oo_.exo_simul is larger than opti…
…ons_.periods
Related to https://forum.dynare.org/t/dynare-4-5-1-issue-with-deterministic-simulation/10450
…ons_.periods
Related to https://forum.dynare.org/t/dynare-4-5-1-issue-with-deterministic-simulation/10450