MAJOR refactor of Magnatune store and the preleminary Jamendo.com service. Both services now use the same database driven model and model items. The Common model populates iteself using a specific database handler for each service.

This will make writing new services that uses a database for local cache MUCH simpler as all that needs to be done is basically write a data-fetcher / parser and a database handler.

This refactor is still a work in progress. It currently compiles and runs (and seems to actually work correctly for both services) , but there are most likely bugs, crashes, leaks, messed up coding conventions, more leaks and general ugliness in liberal amounts spread about in the code