* Remove support for the cover system used in KDE 3.3.
* Cover dragging uses "pure" Qt4 now.  Unfortunately the cover manager is
  still Qt 3 so drag-and-drop from there is temporarily disabled.
* Add a coverId() function that ensures the m_coverId for a CoverInfo is
  properly set before use.


svn path=/trunk/KDE/kdemultimedia/juk/; revision=832069