Bug 18555: Create patron list from patron import

Bug 18555: Create patron list from patron import

Create a patron list from imported patrons to be used for printing patron
cards and other patron list related actions.

To test:
- Apply patch
- Go to Home > Tools > Import patrons
- Select a file to import and check new checkbox 'Create patron list'
- Import file
- Verify that in import results you see the time stamped name of the
  patronlist containig the imported patrons (if any patrons were imported)
- Go to Home > Tools > Patron lists
- Verify that the list shows up and contains the imported patrons

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>