Improve framework agreement

This includes some improvements over the framework_agreement_module.

- When installed, enable the option for purchase pricelists. The module is not usable without.
- Add fields that are often used in Long Term Agreement: incoterm, incoterm address, clauses, shipment origin
- The new fields that exist on the Purchase Order are propagated automatically when the Agreement is selected.

Thanks!
same remark: s/_remarks/_remark/