SYSLINUX conf randomiser

[maandree]

A script, running at boot time, that switched the current SYSLINUX configuration for a ranom per-made is need.

The primary intent is to make it possible to automatically switch bootloader theme between runs (will have to be successful starts of the final boot step, though), so you can get a random pony in the background, with matching colour settings.

HOWEVER, it is possible to make plug-ins to SYSLINUX that can do this. But I think first making it a stand-alone script is easier and allowes for many configurations without having to resize the boot partition to fit more. After that, a SYSLINUX plug-in can be made. This is another issue: issue #20