Changes job status if possible (400 Bad Request is returned otherwise).

Changes job status if possible (400 Bad Request is returned otherwise). The status has to be specified using one of the following keys:<ul><li>OPEN – available when the job has one of the following statuses: ACCEPTED, CANCELED</li><li>ACCEPTED – available when the job has one of the following statuses: OPEN (Vendor and dates have to be set before calling the operation), STARTED</li><li>STARTED – available when the job has one of the following statuses: ACCEPTED, READY</li><li>READY – available when the job has one of the following statuses: STARTED</li><li>CANCELLED – available when the job has one of the following statuses: OPEN, ACCEPTED, STARTED, OFFERS_SENT</li><li>OFFERS_SENT – not available as a target status for this operation</li></ul>