static S uploadToImageServerIfNotThere(BufferedImage img, S name) {
  S md5 = md5OfRGBImage(new RGBImage(img));
  long id = imageServerCheckMD5(md5);
  if (id == 0)
    ret uploadToImageServer_new(img, name);
  else
    ret "http://ai1.lol/images/raw/" + id;
}