removed unused files Random.c/h
Change build process : remove necessity symlink to bitbox files

From now on, the build process does not need symlinking
to the bitbox /lib base kernel distribution. You need to
define a BITBOX

This allows changing kernel, referencing utility scripts also and having
several projects with the same kernel base.

So please just put

export BITBOX=path/to/bitbox/files

on your .bashrc
fixed typos, added AUTHORS
Allow configuring a set of clock speeds and resolution at compile time.

Define a special value in your makefile to enable a set of resolution/timings
set from the kconf.h file.

Only the 640x480 resolutions have been extensively tested, be careful.