Switch from deprecated API; alter album schemas

This switches from the deprecated Freebase API to the Google API
for Freebase, version 1.
It also adjusts the MQL queries made, to cope with the way that
albums and tracks were refactored in Freebase to have tracks attached to
releases which are attached to albums.

Note that in the new API system, you are supposed to request an API key from Google, and then append a "key" parameter to every query. You should do this for the live LPD site!
It will work for a short while without the key, but as soon as you have a moderate number of hits it'll die off.