Downloader cleanHost

Extend the use of clean host (add more checks and features) and make the settings more dummy proof.
Migrate rTorrent options
Log with system encoding
Merge branch 'develop_cleanhost' of git://github.com/mano3m/CouchPotatoServer into mano3m-develop_cleanhost
Allow config delete
Remove prints and actually save deletion
Merge branch 'refs/heads/mano3m-develop_cleanhost' into develop