svoid ele_logUserFeedback(bool plus, O... _) {
  File f = plus ? ele_userPlusLog() : ele_userMinusLog();
  Map map = litorderedmap(paramsPlus(_, computerID := computerID()));
  logStructureWithDate(f, map);
  infoBox("Saved feedback " + (plus ? "+" : "-") + " on " + quote(firstValue(map)));
}