testsuite: explicitly set order=1 for forecast command

tests/conditional_forecasts/3/fs2000_conditional_forecast_initval.mod

@@ -63,7 +63,7 @@ steady(tolx=1e-10,tolf=1e-12);
 
 check;
 
-stoch_simul(irf=0);
+stoch_simul(irf=0,order=1);
 
 conditional_forecast_paths;
 var gy_obs;

tests/conditional_forecasts/4/fs2000_conditional_forecast_histval.mod

@@ -61,7 +61,7 @@ steady;
 
 check;
 
-stoch_simul(irf=0);
+stoch_simul(irf=0,order=1);
 
 conditional_forecast_paths;
 var gy_obs;

tests/smoother2histval/fs2000_smooth_stoch_simul.mod

@@ -87,6 +87,6 @@ steady;
 smoother2histval(period = 5);
 
 options_.loglinear=0;
-stoch_simul(nomoments);
+stoch_simul(nomoments,order=1);
 
 forecast;

tests/stochastic_simulations/histval_predetermined.mod

@@ -54,6 +54,6 @@ b(0) = 0.1;
 a(0) = 0.3;
 end;
 
-stoch_simul(nograph, periods = 200);
+stoch_simul(nograph, periods = 200,order=1);
 
 forecast;
\ No newline at end of file

tests/stochastic_simulations/histval_sto.mod

@@ -49,7 +49,7 @@ a(-1) = 0.3;
 u(-1) = 0.1;
 end;
 
-stoch_simul(nograph, periods = 200);
+stoch_simul(nograph, periods = 200,order=1);
 
 forecast;