add maximum lag info by variable
M_.maximum_endo_lag_by_var = [ ... ];
M_.maximum_exo_lag_by_var = [ ... ];
Where the vectors are the length of M_.orig_endo_nbr
M_.maximum_endo_lag_by_var = [ ... ];
M_.maximum_exo_lag_by_var = [ ... ];
Where the vectors are the length of M_.orig_endo_nbr