This adds a sidepane to lxmusic listing all playlists. In addition it allows for drag and drop within playlists (ie, moving items around) and between playlists. Hovering over a playlist in the sidepane while in drag-and-drop mode loads that playlist so you can seamlessly transfer songs. The cut/copy/paste stubs have been filled in as well. There is still one issue with keeping track of the current song through a drag event, something with xmms2 presumably.