Music library management

This week's release concludes the work to reduce the memory footprint of bliss... for now. We can now comfortably support around 5000 albums. There is more work to do on this but for now it is 'good enough'. If someone has a larger collection that isn't working quite right, let us know.

We also slotted a UI improvement in - when you choose or change album art yourself, you are taken back to the previous screen, not the home page for bliss.

The new release can be found at http://www.blisshq.com/download.html; existing fixes still work!