Install so first file installed matches this correct manual page
name.
(Both manual pages are still installed. And only ntalkd binary is
installed. So no change.)
Add some paragraph breaks to make the man page more readable.
Add the history of the talkd -> ntalkd change as I recall it to
the HISTORY section. All of this to answer PR 13433
- support "talkd -l" for extra (syslog(3)) logging
- fix error in previous announce.c change
- use getopt
- add (missing) -d and -l descriptions to man page
