Compare with "Aspect Switcher" in imagecache_actions

Issue Summary

Imagcache_actions provides a similar but different approach to the same task.
The imagecache approach sets its preferences in imagecache UI, and actually generates a different image based on source image dimensions, saving only one copy.
This module makes the decision on which preset to use at render time - and presents tohse choices in a visible way through the CCK fields management CCK interface.

Other than that, they both work by defining a set of secondary imagecache presets and trigger them as needed, so a lot of similarity there.

I'll add a cross-reference to imagecache_actions to this one. They don't compete, but offer a choice.