The ref-* files are used by checkchroot to find unwanted packages in
the chroots.

# cp ref-* /usr/local/chroot/

 - stable-old is potato
 - different for diff arches
 - "deborphan -f <chroot>" or "ppack -r <chroot> -Oq"  to calculate them
 - the only extras should be:
	apt
	build-essential
	fakeroot (some arches only use sudo and change $fakeroot config item)
	ssmtp
	sudo
