Squash tool sabotage installer

This is a new tool for handling squashfs-based sabotage installs. It can install, create separate tarballs from /src, update itself. it can install to hdd, create image files and update an installation. it can also chroot into the squash root, to customise and then install.
Once we get this in I'll start documenting the usage
some minor fixes too, mostly trivial version bumps and url updates