Bubbleupnp's work display behavior - suitable minimserver tagging

[simoncn]

The recommended approach for this with MinimServer is to use the Group tag for each movement of a work with multiple movements. You can either select the entire group (work) for playing or you can open the group and select individual movements for playing.

The "work headline" approach doesn't allow the whole work to be selected and played as a single operation. It also doesn't cater for the following sequence of tracks in an album:

Track 1 (work 1)
Track 2 (work 1)
Track 3
Track 4 (work 2)
Track 5 (work 2)

If the control point shows this with work headlines before Track 1 and Track 4, it looks like Track 3 is part of work 1.