[IMP] Old hack where uom_id had to be empty in on_change

[IMP] Old hack where uom_id had to be empty in on_change

[IMP] Add purchase order origin on picking

[WIP] Picking type on move for location on routing

[IMP] Provide extra function for custom buttons on picking

[IMP] Action assign optim

[IMP] Push apply should take invoice_state into account.  Propagation of cancel of stock moves should depend on procurement rule