and a lot of stuff.

Basically.

- Move tile management to it's own class.
- Make a tile class, this will allow for some nice per tile on/off features like masks.
- Make a layer keeps it's own tiles.  90% of the time, photoshop users don't use channels, they
use all channels combined, don't take the hit every time to recompose the tiles.
- Turn off a lot of stuff that hasn't been ported yet.

svn path=/trunk/koffice/; revision=141688