ratings and scores use 0 for default value

[Jeff Mitchell]

Caleb Cushing wrote:
> this solves problems with queries like
> 
> select tracks where not rating < 3;

It's true.  I'm just wondering -- since we're so close to release --
whether it would be better (less regression-prone) to modify queries:

select tracks where (rating == 0 or rating <3)

--Jeff