Include protocol scheme in the `rutorrent.addr` attribute. Omission of this gives me a frustratingly unhelpful error `Failed to update torrent list from rTorrent: 'Post mycoolrtorrentserver.com/XMLRPC: unsupported protocol scheme ""'`
* Fixes a logging issue when already downloading a torrent.
* Uses better management of the download queue
* Fixes a constant spamming issue when the queue is empty and there is a download