svoid processConceptsOverwriteFile() {
  File f = getProgramFile(dbProgramID(), "concepts-overwrite.structure.gz");
  if (!f.exists()) ret;
  print("OVERWRITING concepts of " + dbProgramID() + " with " + f);
  clearConceptsOf(dbProgramID());
  renameFile(f, "concepts.structure.gz");
}