WordPress upgrade

We upgraded the WordPress software that runs the blog to the new 2.3.1 version, in response to vulnerabilities present in the old version. There was some downtime this afternoon (intermittent over ~10 minutes) as I switched our installation over to manual (as opposed to Debian package-managed) and then upgraded to the latest version. In the process, I set up a system so that hopefully future upgrades will happen immediately after release of a new stable version, and should cause zero downtime.

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