[kronolith] patch: category management prefs

[Chuck Hagenbuch]

Quoting Brian Keifer <brian@valinor.net>:

> I've been a little confused by the need for two different category
> management sections - one for colors and one for adding/removing/renaming.  
> There was some chatter about it in #horde a while back, so here's a patch 
> that combines the two screens.

Committed, cleaned up (you didn't remove as much code as you could <g>), and
proted to Mnemo as well.

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"After a few minutes the most aromatic and nice smelling Italian coffee 
 will come out of the exhaustpipe." - Our stove-top espresso pot