- Rewrote applet registry code to support the URL hierarchy being built from   config rather than from the applet signatures.
- Rewrote applet registry code to support the URL hierarchy being built from
  config rather than from the applet signatures.

- Exposed a file mapping attribute to facilitate introspection into the
  load/reload process.

- Moved applet config stuff into the applet section of the config object.

--HG--
extra : convert_revision : svn%3Ab4f3b83b-18d6-0310-a2de-c8f40de7a630/Arrow/trunk%4057

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