code: public Options addOption(String opt, String description)
      {
          addOption(opt, null, false, description);
          return this;
      }
docs: Add an option that only contains a short name.
  The option does not take an argument.
  
  @param opt Short single-character name of the option.
  @param description Self-documenting description
  @return the resulting Options instance
  @since 1.3