- since there is apparently no actual way to get the "All" favorites
listing via API, corresponding URLs (.../favourites/?catpath=/) will
be handled by yielding all deviations from all favorite collections of
that user
- the "mature" config key works on a per extractor basis (like "username"
or "password"). values can be the strings "true" or "false", or the
booleans true or false.
- (#14)