Simplified a couple of functions. No change in functionality.
Add getAllAlbums function to Core.Database
Add pages to list all albums or artists with links from main page.
Separate a bunch of data and instance declarations into own module

Moved all the data types describing tables and fields into their
own submodule.
Refactor to reduce the amount of manually-written SQL

Query module automatically generates SQL.
Move more SQL into Query.hs