Save transformable property to landmark

src/landmark/landmark_base.cpp

@@ -145,6 +145,7 @@ YAML::Node LandmarkBase::saveToYaml() const
         node["orientation"] = getO()->getState();
         node["orientation fixed"] = getO()->isFixed();
     }
+    node["transformable"] = getP()->isTransformable();
     return node;
 }