#320 Blackbox does not play nice with RandR

[Ciprian Popovici]

Blackbox doesn't seem to react to screen size changes induced via xrandr. It keeps using the old size. This is particularly annoying in the presence of pivot-capable LCD monitors. Even if one uses xrandr to change rotation (from 1280x1024 to 1024x1280, for instance), Blackbox will act as if nothing happened. It makes things awkward since part of the screen becomes unreachable and the windows won't resize/maximize past the old screen boundaries.