link update-authorized-keys to bin/
motd: remove -D option, make conddiff always false
motd: always show full motd when new
motd: clarify statuses
motd: fix full motd showing when unchanged
motd: use $HOSTNAME which is always present in bash
motd: define function for status messages
motd: clarify empty /etc/motd case
motd: make a function for motd update time
motd: do not hardcode path in messages
lib.bash: remove unused use()

". libfoo.bash || exit" is more consistent anyway
hi: show URL in debug mode
motd: show path consistently
xorf: shut up false warnings

Should probably mark usage() as noreturn or something...
logwipe: FreeBSD 10 is missing some utmp entry types
Makefile: all junk bins are Linux-only
motd: use lib.bash for messages
motd: separate strftime()