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>