code: public Options addOption(String opt, boolean hasArg, String description)
      {
          addOption(opt, null, hasArg, description);
          return this;
      }
docs: Add an option that only contains a short-name.
  It may be specified as requiring an argument.
  
  @param opt Short single-character name of the option.
  @param hasArg flag signally if an argument is required after this option
  @param description Self-documenting description
  @return the resulting Options instance