static Concepts loadConceptsFromFile(File file) {
  new Concepts c;
  c.clearConcepts();
  DynamicObject_loading.set(true);
  try {
    Map<Long, Concept> map = (Map) unstructureGZFile(file);
    c.concepts.putAll(map);
    c.assignConceptsToUs();
    for (long l : map.keySet())
      c.idCounter = max(c.idCounter, l);
  } finally {
    DynamicObject_loading.set(null);
  }
  c.allChanged();
  ret c;
}

Began life as a copy of #1010427