DirectFB surface offsets

After I committed the updates for widgets' rects being relative the
parent, I discovered that it broke the directfb renderer (things get
drawn in the wrong position).  So I will be taking a look at the
directfb surface class, I'm guessing that it isn't using its offset
correctly.

SO DON'T UPDATE YOUR WORK CODE UNTIL I FIX IT MARC!

Darren