- s/MESSAGES/DIAGNOSTICS/, and put message descriptions in a nice list.
- Talk more about how using malloc() in signal handlers is bad.

in /etc/mail.

our smtpd is something other than sendmail.

the -E flag here causes the kernel to printf 'IP Filter: already
initialized'.

Markus Friedl.

for XPG conformance.  We don't use it but programs might check for it.

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

commit, as we want our documentation to be as consistently formatted as
possible (it's getting there :-)).

http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt

with this `!' lines in /etc/hostname.* run even without certain lines
(like a comment) preceeding it.

appropriate mdoc macros to handle these cases.