Fix sizing problem in i3wm tiling window manager GTK

Fix sizing problem in i3wm tiling window manager GTK

Apparently i3wm creates a window of different size than the requested one
without sending a configure-event that would allow XBoard to adapt its
board size. This is now fixed by triggering a first configure-event by
hand. The first resize had to no longer be suppressed to make this work.
(This was not needed anymore anyway, as the board size is now protected
during clock resize.) The -fixedSize option had also to be fixed.