Make the default choice for the chroot shell at the end be "No". This allows
just pressing enter repeatedly to successfully install a reasonable system.
Rename the choices in the partitioning methods dialog to reflect current
reality. In particular, draw a connection between the auto ZFS script and
the auto UFS one, since they fulfill similar functions. I'm not sure the
auto ZFS code is actually experimental anymore, so it might be worth
changing that label still.