[Thinbsd] Screen resolution no longer hardcoded

[Francois Tigeot]

Since it seemed there was a need to specify the screen resolution,
I have added some dhcp parameter to do just that.

It was previously hardcoded to 1280x1024.

The following dhcp options can now be configured:

	option thinbsd-xres code 131 = text;
	option thinbsd-yres code 132 = text;
	option thinbsd-hfreq code 133 = text;
	option thinbsd-vfreq code 134 = text;

They should be self-explanatory.

For now, the frequencies are unused, though.
They are written in /etc/thinbsd.conf and they only need to be put into
xorg.conf by /usr/local/etc/rc.d/xorg.sh in the ramdisk.

I will probably modify this file in the future.

The new image can be downloaded from this URL:

	http://www.thinbsd.org/download/mfsroot-2005-07-24.gz

thinbsd-xres and thinbsd-yres *must* now be configured on your dhcp server
for the system to start properly.

In addition, I have updated the developer's guide to explain the
autoconfiguration process during the system startup.

Enjoy !

-- 
Francois Tigeot, CEO, Zefyris
http://www.zefyris.com/