Print unified version information for all AppleTalk daemons #1745
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For atalkd, papd, a2boot, macipgw, timelord: Add a -v/-V flag that prints version number and short description of the daemon. And for the daemons under contrib/ with code that originate outside of Netatalk, print also the COPYRIGHT information.
Note that -v and -V have the same effect for these daemons, with no extra verbose mode implemented. macipgw was using the latter for normal version output, while the former is common for all other daemons in Netatalk. I'm enabling both for backwards compatibility, but only documenting the former.