Port the cover fetching to use the 'new' amazon web api. The one we currently use is scheduled to be disabled at the end of the month. This code is based on the patch in bug 155257 by Alf Eaton <sites@hubmed.org> Please give this lots and lots of testing. BUG: 155257 CCMAIL: amarok@kde.org

svn path=/branches/stable/extragear/multimedia/amarok/; revision=782339