svn path=/branches/work/kwin_composite/; revision=604805
svn path=/branches/work/kwin_composite/; revision=604801
svn path=/branches/work/kwin_composite/; revision=604568
Add support for changing window brightness. Add DialogParent effect that makes windows that are unaccessible because of modal dialogs darker. Patch by Rivo Laks. svn path=/branches/work/kwin_composite/; revision=603384