After thinking through the ``problem'' of deleting old, unused, badly named or
transferred to .wiki file pages I'm thinking that deleting a wiki page is not the
solution.  Maybe changing the tag ("wikiUnlisted-whatever" ?) and allowing it to
be a new page would be a better solution.  It never leaves the db, it could be
revived, you could query a list of "deleted" wiki pages, etc.  If someone did
reuse the name, the page would come up with a lot of history, but part of that
would be a "page unlisted", so it shouldn't be too confusing.