[IMP] product: name_get matching on commercial_partner_id for suppliers

The name_get of a product will use some information (e.g. default_code) based on the supplier.
The matching of the supplier should use the commercial_partner_id in case the supplier info are on the company and the partner_id in the context belongs to the company (e.g. creates quotation with a contact of the company).
Fixes #1219
Merge branch '7.0' of https://github.com/odoo/odoo into 7.0-win32