Fixes an issue where creating the bills from the purchase orders could
create a bill with quantities vastly different from the received batch
quantities. This would happen when the purchase orders had lines with
quantities to invoice that did not match the receipt quantities.
Instead of creating the bills from the POs, we now generate the bill
and its line values directly from the quantities on the move lines
related to the batch.
- Default to zero is now functional
- Checkbox ("Picked" field) visible on move lines in the batch view
- Checking the Picked field marks the line green
- More tests written to validate functionality
