www.dragonflybsd.org upgrade

[Justin C. Sherrill]

I updated ikiwiki, the system behind www.dragonflybsd.org, from version
2.77 to version 3.14159.  Please let me know if anything is missing; I
haven't found any problems yet.

Among other new features, anyone who is currently set as an admin has
access to a "Wiki Setup" button on the Preferences page where you can
change the settings via a web page interface instead of mucking through
the config file.