code: public static File stringListAsTmpFile( List<String> list ) throws Exception {
          File tempFile = File.createTempFile("jgt-", "txt");
          writeFile(list, tempFile);
          return tempFile;
      }
docs: "Converts" a List of strings to a temporary file. <p/> <p>Useful for those modules that want a file in input and
  one wants to use the parameters.</p>
  
  @param list the list of strings to write to the file (one per row).
  
  @return the created file.
  
  @throws Exception