I've got a few more things to do with newsyslog and then I think I'm done.
Hopefully I can get these done in one go. :).

The first two are: historical log file suffixes like ".YYYYMMDD" and ISO-8601
time spec for rotation (IIRC FreeBSD newsyslog has the latter).

Finally, locking. We don't want logs to get mangled, so some form of
serialization needs to be done. So far I'm thinking create a lock like:

/var/tmp/.newsyslog-lock.var.log.messages

or

/var/log/.lock.messages

Comments appreciated.