Attached is v2 of the patch series.  Changes from v1:

   * Renamed the option from `--merge-prefix' to `--stderr-prefix'
   * stderr is now always prefixed (even with `--no-merge')
   * Added Autoconf-style quadrigraphs @%:@ (for #) and @&t@ (for empty 
string)
   * Bumped `scriptversion'
   * Reordered the patches (close fd 3 is the 1st patch now)
   * Added examples to the documentation
   * Reworked the tests:
      - `#' is now passed via command-line variable assignment instead 
of in the Makefile, avoiding the octal printf mess
      - quadrigraph replacement is tested
      - tested with and without --merge

I expect to hear back from assign@gnu.org today (Monday) with the 
copyright assignment agreement; I'll get that signed and sent ASAP.

Thanks,
Richard