Add TODO
Add LZMA initrd support for SliTaz experiments

Revert this when finished (and take out gzip support as well, we
shouldn't arbitrarily support only one compression format that we
don't use ourselves)
Remove gzip-compressed initrd support

It was only there to support hypothetical third-party initrds that
probably wouldn't boot on our kernel anyway. While I'm trying to
get SliTaz to play the part, it uses smaller LZMA-compressed
images instead.