Doesn't really seem worth making it work; addurl --fast can be used to
get a tree of files in the torrent and then the user can rm the ones they
don't want.
addurl behavior change: When downloading an url ending in .torrent,
it will download files from bittorrent, instead of the old behavior
of adding the torrent file to the repository.
Added Recommends on aria2 and bittornado | bittorrent.
This commit was sponsored by Asbjørn Sloth Tønnesen.
