private void CreateDefaultModuleGroups()
{
module_groups.Add ("native", new ModuleGroup ("native", true, false, false));
module_groups.Add ("dll", new ModuleGroup ("dll", false, true, false));
module_groups.Add ("runtime", new ModuleGroup ("runtime", false, true, false));
module_groups.Add ("managed", new ModuleGroup ("managed", false, true, true));
module_groups.Add ("user", new ModuleGroup ("user", false, true, true));
module_groups.Add ("corlib", new ModuleGroup ("corlib", false, true, true));
}