Update to 3.20130212. From the changelog:

  * htmlscrubber: Allow the bitcoin URI scheme.
  * htmlscrubber: Allow the URI schemes of major VCS's.
  * aggregate: When run with --aggregate, if an aggregation is already
    running, don't go on and --refresh.
  * trail: Avoid excess dependencies between pages in the trail
    and the page defining the trail. Thanks, smcv.
  * opendiscussion: Don't allow editing discussion pages if discussion pages
    are disabled. (smcv)
  * poll: Add expandable option to allow users to easily add new choices to
    a poll.
  * trail: Avoid massive slowdown caused by pagetemplate hook when displaying
    dynamic cgi pages, which cannot use trail anyway.
  * Deal with empty diffurl in configuration.
  * cvs: Various fixes. (schmonz)
  * highlight: Now adds a span with class highlight-<extension> around
    highlighted content, allowing for language-specific css styling.

(schmonz)