Remove *.bak config files.
Closes-PR: ports/1813
Forgotten by: peter
Please don't forget to close PR's. Duplicated effort is effort that could
be used elsewhere. ;-)
(1) Don't use += for CATEGORIES.
(2) Add MAN8 to compress nntpcache.8.
(3) Remove port name from front of pkg/COMMENT.
(4) List config files in pkg/PLIST.
(5) Name of manpage is nntpcache.8, not nntpcached.8.
