Bug 12827: NewOrder should not return basketno

Bug 12827: NewOrder should not return basketno

Since the basketno parameter is needed to insert an order, it is useless
to return it.

This patch changes the prototype for the C4::Acquisition::NewOrder
subroutine. The return value is now a scalar containing the ordernumber
created.

Test plan:
Verify there is no regression on an acquisition workflow:
1/ Create an order with several items
2/ Modify the order
3/ Receive some items
4/ Cancel the receipt
4/ Receive some items
5/ Receive all remaining items
6/ Cancel the receipt

Signed-off-by: Zeno Tajoli <z.tajoli@cineca.it>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>