We were looking to see if we could speed up our tracker
a bit, and discovered that roundup.backends.__init__
does some exhaustive searching for working backends,
making a few thousand pointless calls to open(), etc.,
on every page view.  As far as I can tell, the only
thing in the entire system to depend on this code is
the installation code; perhaps it could be moved to a
function like list_available_backends() or something,
and that code could call the function instead?