Updates to poLine Cost

Overview:
Adjustment information is being moved out of orders and into invoicing. This means we can remove adjustments from poLine. At the same time, we need to be able to specify separate list prices for physical and electronic. Here's a rundown of the changes required:

• Remove poLine.adjustments
• Rename cost.listPrice to cost.listUnitPrice
• Add cost.listUnitPriceElectronic
• Add cost.discount
• Add cost.discountType - "percentage" or "amount" (default to "percentage")
• Add cost.additionalCost - an amount
• cost.poLineEstimatedPrice is calculated as follows:

  baseListPrice = (listUnitPrice * quantityPhysical) + (listUnitPriceElectronic * quantityElectronic)
  discountAmount = discountType == PERCENTAGE ? (baseListPrice * discount / 100) : discount
  poLineEstimatedPrice = baseListPrice + additonalCost - discountAmount
  

• N.B. additionalCost is NOT factored into discount calculations
• NOTE: The estimated price is always calculated by mod-orders upon creation/update, and stored... even if the estimated price is populated in the request.

see UIOR-142

Acceptance Criteria:

• Schemas and examples are updated as described above
• Unit and API tests have been updated as needed
• poLineEstimatedPrice calculation has been updated