from the burned-on-CD register.pl script into the downloaded
netbed-setup.pl script.  Doesn't actually change anything, but
a CD burned with the new register.pl and intended for DHCP could
be fixed by a revised netbed-setup without requiring a new CD.

This is a transition commit to fix some minor brokenness and
inflexibility before I really revamp things to enable DHCP support,
which may require a v5 CD instead of incremental changes to the v4 CD.
We'll see...