* Implement drag-and-drop retagging of songs while using the tree view playlist mode, fixing bug 62307.
* In the process, I've found many instances where updating a tag sometimes wouldn't update a search playlist, and so I've fixed all those bugs I could find.

Drag-and-drop retagging only works dragging songs onto the Artist, Album, or Genre subitems, however I still find it pretty useful.

CCMAIL:62307-done@bugs.kde.org

svn path=/trunk/kdemultimedia/juk/; revision=322682