dbiff: biff+comsat without comsat

1.4 (8 October 2004):
   Documentation updates that I forgot to add for the 1.0 branch.  Also updated
   the version number, since I forgot that, too.

1.3 (28 May 2004):
   Fixed another bug in qbiff_readmsg(); this one was causing the From: address
   to be lost if the subject line came first and was longer than a line.

1.2 (15 May 2004):
   Fixed a bug in qbiff_readmsg() that was chopping the last character off
   of message lines.

1.1 (9 May 2004):
   Fixed some bugs in get_line().  This only makes a difference if you receive
   emails with lines more than 8192 characters long.

1.0 (28 March 2004):
   I got a patch and an idea from Moshe, so I rewrote the whole thing.
   dbiff is now stronger, faster, better, &c, and also supports the
   FreeBSD "biff b" mode, as well as a flag for sending biff messages
   only to the most recently active terminal.  Thanks to Moshe Jacobson
   (runslinux.net) for the idle patch as well as informing me about
   biff b.  I added bigass array and some sorting to his idle checking,
   so dbiff will deliver messages even if mail arrives while you're
   closing a window.  Hooray.

   On autoconf, it's mainly for that utmp thing.  The utmp handling I
   had before was an afterthought and a horrible hack, and despite it's
   shortcomings, the fact that I spent 5 times as much time writing m4
   as I did C, and the fact that I'm running a ginormous configure
   script to compile an average of 2.5 files, I think that autoconf
   is the best solution for such a problem.

   On automake, it's because I hate you.  Or for consistency.  Take your
   pick.