code: public static String addToPath(String basePath, String fileName)
      {
          return Util.addToPath(basePath, fileName, '\0');
      }
docs: Add this param to this path.
  @param strOldURL The original URL to add this param to.
  @param strParam The parameter to add.
  @param strData The data this parameter is set to.
  @param bAddIfNull Add an empty param if the data is null?
  @return The new URL string.