ADMIN: Site update, possible downtime

As a result of a slight change in the Discourse software upgrade requirements, I need to do a little upgrading to the underlying server that runs PIDForum. This means the potential for some downtime, although the exact duration and impact is difficult to know beforehand. I will do my best to keep any downtime to an absolute minimum, and will alert here when the work is completed.

And thanks to some lucky breaks on a couple of updates, no downtime was necessary. Enjoy a newly updated PIDForum!