* Add the krita/image classes necessary to make flakifying krita a reality
* Ditto for the krita/ui classes
* add kis_tile_compressor (but don't use it yet)
* make kis_selection a type of mask and prepare for making alpha masks an explicit
(and d&d-able, ccp-able entity)
* prepare painterly overlay masks 
* prepare per-layer filter masks
* prepare separating layers into color channels (which are a kind of mask)

svn path=/trunk/koffice/; revision=610191