Update vreen.
Add Update MyMusic/Recommendations in context menu
Lock update actions while updating in progress.
Little function sorting.
Set count in LoadSongList as uint.

Negative count does not make sense.
Fix increasing of calls RecommendationsLoaded/MyMusicLoaded with each
update.
Show Update My Music/Recommendations menu items only on relevant places.
Add "Find this artist".
Set artist name in SearchBoxWidget, when searching for an artist.