fix indentation in statusbar.xml
BrowseFragment.java whitespace
add info() to Item, Album, and Artist for debugging
fix MPD album and artist merging
get year of album in MPD
add getAlbumArtistAsArtist in Music
use getArtistAsArtist in NowPlayingFragment
improve album cache
fix call in add album to playlist
add getAlbumAsAlbum to Music and use it in NowPlayingFragment
remove setting "show covers in full album list" -> always show them
fix different artists display in SongsFragment
add notifier strings for album cache refresh
call getSongs with album artist

it make no sense to call songs from album with null artist
as we know all artists for all albums