* use .Dv and .Tn in the man pages as appropriate
* KNF a bit
The following were inspired by similar changes in openbsd, but may
have additional improvements by me:
* add more check_login tests to the parser rules
* nuke a few memory leaks in the parser rules
* clear passwords before free()ing them, for safety
* don't display \r\n in setproctitle() output
* add support for -U, which enables managing /var/run/utmp entries for
connections. solves [bin/2217] by Jason Downs <downsj@teeny.org>
* fix oob handling for STAT command
* use SIG_ERR instead of -1
