Playlist sorting

[Téo Mrnjavac]

Dear Amarok contributors, testers and trunk users

The under the hood part of multilevel playlist sorting is mostly
feature complete in trunk as of today 31/7/2009. This means that
starting now, everyone is invited to test the sorting functionality
and file bug reports, and as always I appreciate all sorts of
constructive feedback.

Important: while the sorting logic is mostly done, the interface is
*not*. So you might want to wait a few weeks before reporting bugs
about the interface (which will be redone from scratch), and focus
instead on testing the sorting itself, i.e. if the order of the tracks
matches the currently defined sorting scheme.

Cheers
Téo