Bug 15184: Add the ability to duplicate existing order lines

Bug 15184: Add the ability to duplicate existing order lines

This patchset adds the ability to duplicate existing order lines to a
given basket. It will help acquisitions of serials of when the same
publication is ordered frequently.

The workflow will be:
- Create a new basket
- Use the "Add to basket" button
- Select the new entry "From existing orders (copy)"
- Search and select the order you want to duplicate
- Define some default values for these orders
- Duplicate!

Sponsored-by: BULAC - http://www.bulac.fr/
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>