When TEMPLATE_ROOT_WITH_PARTITIONS is set, include (GPT) partition table
and install actual OS on the first one. This allows installing grub, or
other bootloader.
FixesQubesOS/qubes-issues#2577
Added a few more whonix replacement tweaks
Updated umount_kill.sh to be able to umount directories that have been deleted
Added a DEBUG feature to save / use already created debootstrap image to save time debugging
Split $DIST to distribution name and version (builder_setup script) and search
for scripts first $DIST-specific, but then for given distribution.
Also move out some Fedora-specific things to scripts_fc17.