Provide meaningful error message if oo_.exo_simul is larger than options_.periods

(cherry picked from commit 97b894a1)

matlab/perfect-foresight-models/perfect_foresight_setup.m

@@ -51,6 +51,10 @@ if options_.periods == 0
     error('PERFECT_FORESIGHT_SETUP: number of periods for the simulation isn''t specified')
 end
 
+if options_.periods<max([M_.det_shocks.periods])
+    error('PERFECT_FORESIGHT_SETUP: number of periods for the simulation is specified to be smaller than the period of the last shock')
+end
+
 if ~options_.initval_file
     if isempty(options_.datafile)
         oo_=make_ex_(M_,options_,oo_);