docs: public synchronized boolean remove(Object key)
                      throws IOException,
                      EOFException,
                      FileManagerException,
                      ClassNotFoundException,
                      HashtableOnDiskException {
          if (filemgr == null) {
              throw new HashtableOnDiskException("No Filemanager");
          }
  
          if (key == null)
              return false; // no null keys allowed
  
          HashtableEntry e = findEntry(key, RETRIEVE_KEY, !CHECK_EXPIRED);
          if (e == null)
              return false; // not found
  
          boolean answer = remove(e);
          htoddc.returnToHashtableEntryPool(e);
          return answer;
      }