[html-formfu] new 'output processors' provide pretty-printed html

[Carl Franks]

I've added a new feature (in svn) - if you want properly indented
html, you now only need to add this to your form config:

    ---
    output_processors:
      - Indent

I've also created another output processor to strip all unnecessary
spaces and linebreaks, to reduce download size - but I need to give it
some real-world tests to ensure it doesn't cause any rendering
problems.

Carl