Statuses should be removed when uninstalling

I considered this when first writing the uninstall hook but checked the core PayPal module and found that it does not delete its statuses, as I suspect doing this could cause database consistency issues as some orders may then have an undefined status.

Looking again, the Google Checkout module does not delete its statuses either, but unlocks them so they can be modified at /admin/store/settings/orders/edit/workflow. This approach has been implemented and committed to CVS.