anchor.diff:  , pyacoustid
   , pyechonest
   , pylast
  +, python-mpd2
   , pyxdg
   , pyyaml
   , rarfile
  
positive.code: , jinja2
  , mock
  , mp3val
  , mpd
  , munkres
  , musicbrainzngs
  , mutagen
  
negative.code:     fetchart = requests != null;
      lastgenre = pylast != null;
      lastimport = pylast != null;
      mpdstats = python-mpd2 != null;
      mpdupdate = python-mpd2 != null;
      replaygain = bs1770gain != null;
      thumbnails = pyxdg != null;
      web = flask != null;
  