code: @Override
      protected String[] flatten(@SuppressWarnings("unused") Options options,
              String[] arguments,
              @SuppressWarnings("unused") boolean stopAtNonOption)
      {
          // just echo the arguments
          return arguments;
      }
docs: <p>A simple implementation of {@link Parser}'s abstract
  {@link Parser#flatten(Options, String[], boolean) flatten} method.</p>
  
  <p><b>Note:</b> <code>options</code> and <code>stopAtNonOption</code>
  are not used in this <code>flatten</code> method.</p>
  
  @param options The command line {@link Options}
  @param arguments The command line arguments to be parsed
  @param stopAtNonOption Specifies whether to stop flattening
  when an non option is found.
  @return The <code>arguments</code> String array.