Basic audiobook support
Upgrade database to version 14 (artist groups and seek)
- add songartistid to support artist groups
- add corresponding trigger
- add seek field for later use (to save playback position)
- add G_ARTISTS and adjust queries
- add smart playlists Podcasts/Audiobooks with db upgrade
Merge branch 'audiobooks' into db_upgrade_14
Don't announce smart playlists with no items
Fix bug where sort fields were not implemented in group replies
Support for daap.songartistid
Add seek to standard db queries