[FIX] sale_ux: field commercial_partner_id should be compute_related=True (#200)
[FIX] sale_ux: field commercial_partner_id should be compute_related=True (#200)

This is needed to fix the following problem: adding a partner to res_partner.child_ids will mark all element of child_ids as 'todo'
and trigger a write on res_parner.commercial_partner_id for all element of the child_ids and then on the related field
sale_order.commercial_partner_id. This can cause problem if partner in child_ids belong to different company and have invoices. This will throw a
read access error when doing the _write method of sale_order. Adding the compute_related=True to sale_order.commercial_partner_id
ensure that the _write on that field is done in sudo.
ingadhoc/sale,ingadhoc/sale,ingadhoc/sale,ingadhoc/sale