reg3:: do not call generate_fulls more than needed

geometry.cpp

@@ -585,6 +585,8 @@ void geometry_information::prepare_basics() {
   
   heptshape = nullptr;
 
+  xp_order = 0;
+
   if(arcm::in() && !prod) 
     ginf[gArchimedean].cclass = gcHyperbolic;
   

reg3.cpp

@@ -2748,6 +2748,7 @@ EX int matrix_order(const transmatrix A) {
 
 EX void generate_fulls() {
   reg3::generate_cellrotations();
+  if(cgi.xp_order) return;
 
   auto cons = [&] (int i0, int i1, int i2) {
     transmatrix T = build_matrix(cgi.adjmoves[ 0]*C0, cgi.adjmoves[ 1]*C0, cgi.adjmoves[ 2]*C0, C0);