Reinitialize the index for molecule and parameter with clear_model

models.pl

@@ -197,6 +197,8 @@ clear_model :-
   ),
   set_option(show, {}),
   retractall(nusmv:query_molecules(_)),
+  nb_setval(molecule_index, 0),
+  nb_setval(parameter_index, 0),
   assertz(nusmv:query_molecules([])).