* fix «take current directory as new collection directory when called without collection paths» bug.
+ handle flac files.
* debug info in saveMetadata() was announcing itself as coming from loadMetadata().
* fix «UnboundLocalError: local variable 'f' referenced before assignment» bug.
* s/Player.nowPlaying/Player.songChanged/. change complex to comply.
+ Player.nowPlaying() returns as dbus method.
* correctly detect file extension (instead of assuming it's just 3 chars long).
* be quiet.