8.0 : Add module sale_partner_order_policy

This module is the "twin" of the module purchase_partner_invoice_method that was merged yesterday in OCA/purchase-workflow. I promised that if the module purchase_partner_invoice_method was merged in OCA/purchase-workflow, then I would develop the equivalent module for sale. Here it is !
I kept the string of the field that is present on the sale.order object. I can agree with you that OpenERP S.A. didn't choose the best possible name on sale.order, but I want to keep that name, so that the user will understand the link between the field on res.partner and the field on sale.order.