irr torus works only in orientable for now -- disabled for other

euclid.cpp

@@ -509,6 +509,7 @@ EX namespace euc {
   
   EX bool valid_irr_torus() {
     if(!IRREGULAR) return true;
+    if(eu.twisted) return false;
     for(int i=0; i<2; i++) {
       auto x = eu.user_axes[i];
       coord dm = eutester;

goldberg.cpp

@@ -751,7 +751,7 @@ EX namespace gp {
       dialog::addBoolItem(XLAT("irregular"), IRREGULAR, 'i');
       dialog::add_action(dialog::add_confirmation([=] () { 
         if(min_quality && !irr::bitruncations_requested) irr::bitruncations_requested++;
-        if(euclid && !bounded) { 
+        if(euclid && (!bounded || nonorientable)) { 
           println(hlog, XLAT("To create Euclidean irregular tesselations, first enable a torus"));
           return;
           }