Another one of my infamous huge commits... Reintroduce lazy loading to the Jamendo...

Another one of my infamous huge commits... Reintroduce lazy loading to the Jamendo service using the new ServiceSqlQueryMaker and ServiceSqlCollection. YAY! This should be flexible enough to drive all database based services, and can be extended to use arbitrary sublcasses of the service meta items via a factory class that defines what database rows needs to be fetched for each sublcass

git-svn-id: svn+ssh://ianmonroe@svn.kde.org/home/kde/trunk/extragear/multimedia/amarok@668001 283d02a7-25f6-0310-bc7c-ecb5cbfe19da