This is necessary because qemu and gem5 now use the same build folder.
Separate ./run -e and -f for kernel options before and after the ' - '.
This was already the better thing to do when -E was introduced,
but lkmc_nonet prompted me to do it nicer now.
Use the common script to find the out_dir on every toplevel script.
Include usage man pages on README.
Improve GEM5 documentation in general.
Fix documentation for x86 kernel module debugging example, fop_write had been made static,
and use timer.ko instead of fops which is more reliable and fun.
