- Fix: partners can no longer have default carrier accounts that are
archived.
- Refactor: remove write/create overrides to replace them with
computed/stored fields.
Add the ability to view all the transporter accounts from the sales
configuration menu.
Add company_id to delivery.carrier.account model as a related field
to delivery.carrier. Also constrain the delivery.carrier and res.partner
associated to an account to be linked to the same company.
Fixes#113
