Import Tiny Core's deb2tcz script

This script can be used by Tiny Core to unpack .deb files and repackage them
as .tcz extensions. Once made to work with Bash, it would allow converting .deb
files and bundling them with the ISO.
Modify deb2tcz.sh to work on distros not TC

deb2tcz.sh now works with Bash, and doesn't use hard-coded paths