Groupings of playlists, expanding into individual tabs

[Adam Olsen]

I'm not sure of how it would be done, it might be a little complicated but here goes. I'd like to be able to have groupings of albums/playlists. An example would be a way of calling up all my 'Swedish pop music' which would expand into a series of tabs with all the albums I had added to that grouping 'swedish pop music'. I think some other features would need to be implemented before it to make it truely work, namely more options of manipulating albums/artists by right clicking on one song from that album/artist.

This ticket was migrated from the old trac: re #646