Changes since DRUPAL-6--2-0-BETA3:
- #353148 by schildi: imagecache update_4: "ALTER TABLE" executed twice.
- #304376 by Roger López, beholder and drewish: Update function from 5.x -> 6.x.
- Fixing some warnings in the imagecache_ui.module.
- #335780 by drewish: Actions define $image as passed by reference, but call_user_func doesn't support this.
- #298555 by mleicester and drewish: Prevent any image manipulation where a preset has no actions.
- #318430 by dman and drewish: Show a 'preview' image when editing imagecache presets, for easy testing.
- #322155 by thePanz: Pass class attribute to the non-linking formatters.
- #331400 by Steve Dondley: Document the need to grant permissions to presets in README.txt.
- #297230 by joachim: Typos in preset description text.