- New feature: shift+ctrl+t in Mesh editmode splits quads in exact opposite

way. Requested for low-poly modeling.

- fix: on exit editmode, the code always created a mesh->dvert block...
  silly, this made other code confused which decided whether to use
  dverts (vertex groups) or not.

- removed obsolete call from armature.c. Also fixed name of function there,
  preparation work for nicer support in Blender for "deform envelopes"

source/blender/src/space.c

@@ -1613,8 +1613,8 @@ static void winqreadview3dspace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 				break;
 			case TKEY:
 				if(G.obedit){
-					if((G.qual==LR_CTRLKEY) && G.obedit->type==OB_MESH) {
-						convert_to_triface(0);
+					if((G.qual & LR_CTRLKEY) && G.obedit->type==OB_MESH) {
+						convert_to_triface(G.qual & LR_SHIFTKEY);
 						allqueue(REDRAWVIEW3D, 0);
 						countall();
 						DAG_object_flush_update(G.scene, G.obedit, OB_RECALC_DATA);