This allows us to specify both beta and rc versions.
Requires SQL:
ALTER TABLE core_version RENAME COLUMN beta TO testing;
ALTER TABLE core_version ALTER COLUMN testing TYPE integer USING CASE WHEN testing THEN 2 ELSE 0 END;
This replaces the previous ugly hack where beta versions had a negative number
as latestminor, giving a much cleaner model.
Requires SQL:
ALTER TABLE core_version ADD COLUMN beta boolean NOT NULL DEFAULT 'f';
ALTER TABLE core_version ALTER COLUMN beta DROP DEFAULT;
(Yes, we really need to move to something that can do automatic migrations)
