Automatic merge of Transifex translations
* Added empty playlist tooltip.
Automatic merge of Transifex translations
Remove another .. include path :P
Remove last output when a second instance is started
Make --help work even if another instance is running
Allow disabling song change notifications

This is a hack actually, it would be better to allow disabling plugins
in a generic way
Hide song change notification setting on non-linux
Automatic merge of Transifex translations
Hide /Volumes if we made it visible when closing the settings dialog
Retry if the /Volumes entry is still not found after our wait
Cache validation. Needs a DataLoader (itunes is 1.5mb request)
Prevent unnecessary request on startup. Infosystem takes care of it
Twisted header fix, stylefix
Automatic merge of Transifex translations
Check for spotify binary on osx in same location as linux
* Show charts-loading error even in non-verbose mode.
Automatic merge of Transifex translations
* Cleaned up PlaylistInterface.
* Implemented new PlaylistInterface for PlayableProxyModelPlaylistInterface.