Replace 800x600 width a resolution from a .h file. Lots of positions are still hardco...

[ccbs] / bigscreen / tinyptc / AUTHORS

X11 version done by Alessandro Gatti <a.gatti@tiscali.it>
XVideo/XSHM target written by Fred Howell <foohoo@shaw.ca>
Original windows version done by Glenn Fiedler <gaffer@gaffer.org>