Bug fix in SelectThemePlugin

Thanks Mark A. for finding this one.

And there's also an enhancement to NewMeansNewPlugin so that you can turn it off for new journals as described here.

Updating instructions can be found here.

And here are some changesets if you're interested:

http://trac.tiddlywiki.org/changeset/6761
http://trac.tiddlywiki.org/changeset/6743