the "simul" option of "stoch_simul" simulates on more periods than required
The point is that the oo_.exo_simul vector has length options_.periods+M_.maximum_lag+M_.maximum_lead (see make_ex_.m).
This makes sense in a deterministic context, but in a stochastic context there it should only be of length options_.periods.
This makes the oo_.endo_simul of length 2*M_.maximum_lag+options_.periods+M_.maximum_lead (because it adds initial conditions), while it should be of length M_.maximum_lag+options_.periods.
This is not a big issue since one can just truncate the extra periods, but this confuses some users.