Bug 14752 - Add multiple copies to a basket at once

Bug 14752 - Add multiple copies to a basket at once

This patch add an 'Add multiple copies' button on the new order page in
acquisitions.  While processing the multiple copies a modal is
displayed.

To test:
1 - Add an order to an acquisitions basket
2 - Choose to add multiple items
3 - A modal shouold warn about ignoring UniqueItemFields from syspref
4 - When submitting the modal should popup until all items are processed.
5 - The modal should disappear after items are added.
6 - Items should be cloned, minus unique fields
7 - Enable autoBarcode for various formats, ensure you are warned that
barcodes will be generated, and ensure they are generated correctly

Sponsored by: Middletown Township Public Library (http://www.mtpl.org)

Signed-off-by: sonia BOUIS <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>