be sure to remove filres before mknod'ing them again.
Also speed up some rm constructs.
Discussed with hugh@

fix my previously bogus MAKEDEVs.
If you used pf on a non-i386. the major device number has changed,
and you'll need to recreate /dev/pf
ok theo

licence in a way that makes ipf not free according to the rules we
established over 5 years ago, at www.openbsd.org/goals.html (and those
same basic rules govern the other *BSD projects too).  Specifically,
Darren says that modified versions are not permitted.  But software
which OpenBSD uses and redistributes must be free to all (be they
people or companies), for any purpose they wish to use it, including
modification, use, peeing on, or even integration into baby mulching
machines or atomic bombs to be dropped on Australia.  Furthermore, we
know of a number of companies using ipf with modification like us, who
are now in the same situation, and we hope that some of them will work
with us to fill this gap that now exists in OpenBSD (temporarily, we
hope).

Has side effect of constraining dmz dev entries to the ttyXX convention.

in some MAKEDEVs, will see to them in a separate commit.

during installs where there is no MAKEDEV.local.

Added 'all' option to create a reasonable amount of standard devices.
Tape devices now called after their kernel names, (ie. ts0, ht0) and
not mt? for all of them. mt? names are kept as symbolic links anyway
so that it don't break anything.