added check_options are the same as steady_options. Added option

nocheck to 'check' in test fs2000/fs2000a as there is a unit root and
the user provided _steadystate.m doesn't solve the static equations

DynareBison.yy

@@ -849,7 +849,7 @@ check_options_list : check_options_list COMMA check_options
                    | check_options
                    ;
 
-check_options : o_solve_algo;
+check_options : steady_options;
 
 model_info : MODEL_INFO ';'
              { driver.model_info(); }