experiment with forcing the display opt onto the main page

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@40355 15284696-431f-4ddb-bdfa-cd5b030d7da7

display/d.vect/main.c

@@ -123,7 +123,7 @@ int main(int argc, char **argv)
     display_opt = G_define_option();
     display_opt->key = "display";
     display_opt->type = TYPE_STRING;
-    display_opt->required = NO;
+    display_opt->required = YES;
     display_opt->multiple = YES;
     display_opt->answer = "shape";
     display_opt->options = "shape,cat,topo,dir,attr,zcoor";