The "Configure Additional Network Services" screen does not show up
during Standard installation but can be accessible at the end of the
installation procedure. So, let's move that part at the end of the
installation procedure. If I cut&paste that part, cvs diff gives me a
very garbled diff (which can be very hard to read) for an unknown reason,
so I'll just cut that part in the present commit and I'll re-add it in
the next commit.