+* It calles abs2rel about 16% more often with the patch, which makes it
+ a bit slower, since abs2rel is not very efficient. (This omits abs2rel
+ calls that might be memoized away already.) This seems to be due to one
+ extra abs2rel for the toplevel wiki page due to the nicely cleaned up code
+ in `parentlinks` -- so I'm not really complaining.. Especially since the
+ patch adds a new nice memoizable `urlto`.
+* The rss page name generation code seems unnecesarily roundabout, I'm sure
+ that can be cleaned up somehow, perhaps by making `htmlpage` more
+ generic.