Draft: allow cross-CS links for Clone
Draft: allow cross-CS links for Clone

fixes drag-drop issues
https://forum.freecadweb.org/viewtopic.php?f=3&t=32677&p=272896#p272896

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master