- New upstream stable branch 1.4.0.
    - Uses febootstrap-supermin-helper, and a different way of constructing the
        supermin appliance.
    - Remove aug_clear patch, since this is included in 1.4 branch.
    - Update BRs and Requires by comparing with Rawhide.
    - New tool: virt-make-fs.
    - New bash completion script.