code: public void usageDetail(
              final char commandPrefix,
              final ICmdLineArg<?> arg,
              final int _indentLevel)
      {
          nameIt(commandPrefix, arg);
          String help = ((AbstractCLA<?>) arg).getHelp();
          if (help != null)
          {
              if (help.length() > 40)
                  help = help.substring(0, 40);
              allign(29);
              append(help);
              unallign();
          }
      }
docs: <p>
  usageDetail.
  </p>
  
  @param commandPrefix a char.
  @param arg a {@link com.obdobion.argument.type.ICmdLineArg} object.
  @param _indentLevel a int.