[development] Modules page rework

[Earl Miles]

I've done another sort semi-functional mockup here:

I'm continuing this in an issue http://drupal.org/node/76340

http://drupal.org/files/issues/modules-enabled.png
http://drupal.org/files/issues/modules-disabled.png

It could really benefit from some theming, but that's another minor 
issue. I made some comments about the decisions that went into this 
mockup. Further commentary would be lovely.