* More or less rewrote BStatusBar, too:
- Draw() now only redraws something when it's part of the updateRect.
- no more flickering (uses B_TRANSPARENT_COLOR now), this fixes bug #530.
- added Dano/Zeta-style SetTo() method.
- big cleanup.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17857 a95241bf-73f2-0310-859d-f6bbb57e9c96