static void copyCAL(CirclesAndLines cal1, CirclesAndLines cal2) {
  if (cal1 == cal2) ret;
  copyList(cal1.circles, cal2.circles);
  copyList(cal1.lines, cal2.lines);
  copyFields(cal1, cal2, 'defaultImageID,  'arrowClass, 'circleClass, 'imgZoom, 'imageForUserMadeNodes, 'title, 'globalID);
  copyListeners(cal1, cal2);
}