static bool deleteAllConceptsOfType(S progID, S conceptClass) {
  RemoteDB db = new RemoteDB(progID);
  if (db.functional()) {
    L<RC> list = db.xlist(conceptClass);
    if (empty(list)) false;
    print("Deleting " + n(list, "concepts"));
    db.xdelete(list);
    true;
  }
  throw todo("Can't do this offline yet (streamline saving first)");
  //Concepts c = new Concepts(progID).safeLoad();
}