Sort music brainz releases according to status
Make sure SongSender is deleted when client disconnects.
Try fixing race condition in fftw by adding mutex for fftw_* function calls suggested here: http://www.fftw.org/fftw3_doc/Thread-safety.html. Updates #4643.
Merge branch 'master' of https://github.com/clementine-player/Clementine