Correct a regression in matrix multiplication order

src/ifcgeom/IfcGeomFunctions.cpp

@@ -156,7 +156,7 @@ bool IfcGeom::convert_openings(const Ifc2x3::IfcProduct::ptr entity, const Ifc2x
 
 			const unsigned int current_size = (const unsigned int) opening_shapes.size();
 			for ( unsigned int i = last_size; i < current_size; ++ i ) {
-				opening_shapes[i].move(opening_trsf);
+				opening_shapes[i].prepend(opening_trsf);
 			}
 			last_size = current_size;
 		}

src/ifcgeom/IfcGeomObjects.cpp

@@ -442,14 +442,14 @@ IfcGeomObjects::IfcGeomShapeModelObject* create_shape_model_for_next_entity() {
 			}
 			if ( use_world_coords ) {
 				for ( IfcGeom::IfcRepresentationShapeItems::iterator it = opened_shapes.begin(); it != opened_shapes.end(); ++ it ) {
-					it->move(trsf);
+					it->prepend(trsf);
 				}
 				trsf = gp_Trsf();
 			}
 			shape = new IfcGeomObjects::IfcRepresentationShapeModel(shaperep->entity->id(),opened_shapes);
 		} else if ( use_world_coords ) {
 			for ( IfcGeom::IfcRepresentationShapeItems::iterator it = shapes.begin(); it != shapes.end(); ++ it ) {
-				it->move(trsf);
+				it->prepend(trsf);
 			}
 			trsf = gp_Trsf();
 			shape = new IfcGeomObjects::IfcRepresentationShapeModel(shaperep->entity->id(),shapes);

src/ifcgeom/IfcGeomShapes.cpp

@@ -374,7 +374,7 @@ bool IfcGeom::convert(const Ifc2x3::IfcMappedItem::ptr l, IfcRepresentationShape
 	const unsigned int previous_size = (const unsigned int) shapes.size();
 	bool b = IfcGeom::convert_shapes(map->MappedRepresentation(),shapes);
 	for ( unsigned int i = previous_size; i < shapes.size(); ++ i ) {
-		shapes[i].move(gtrsf);
+		shapes[i].append(gtrsf);
 	}
 	return b;
 }

src/ifcgeom/IfcRepresentationShapeItem.h

@@ -40,7 +40,8 @@ namespace IfcGeom {
 			: shape(shape), style(style) {}
 		IfcRepresentationShapeItem(const TopoDS_Shape& shape)
 			: shape(shape), style(0) {}
-		void move(const gp_GTrsf& trsf) { placement.Multiply(trsf); }
+		void append(const gp_GTrsf& trsf) { placement.Multiply(trsf); }
+		void prepend(const gp_GTrsf& trsf) { placement.PreMultiply(trsf); }
 		const TopoDS_Shape& Shape() const { return shape; }
 		const gp_GTrsf& Placement() const { return placement; }
 		bool hasStyle() const { return style != 0; }