[WIP] Fix orderpoint
[IMP]  Warehouse orderpoint uom is related, take into account procurement uom for orderpoint calc
[FIX] Use correct uom field
[WIP] Purchase order cancel or done results in procurement state being changed immediately
[IMP] Make sure procurement goes only in exception on cancel + simplify wkf
[FIX] mrp: produced lines weren't linked to the MO + used the quantities entered in wizard as real quantities to consume
[MERGE] branch of jco with fix of orderpoint computation + small refactoring of action_cancel() of purchase.order