Thanks for that one, again, it's great!
One minor thing I noticed, seen on http://www.bddebian.com/~wiki/recent_changes/: The links to user pages of e.g. MichaelBanck or GianlucaGuida don't work, as they're being linked to http://www.bddebian.com/~wiki/user/MichaelBanck, whereas it should be http://www.bddebian.com/~wiki/user/michaelbanck.
I've fixed this.. --Joey
Another one. If you change the recentchangespage configuration option, (it seems to me) that the pages from the old hierarchy will not be removed from the disk. But then, changing this should be a rather uncommon thing.
And fixed this, by making it look at all *._change pages, not just those in a specific directory, when deciding which to expire. --Joey