Bug 8033: This patch adds print slips to self checkout.

Bug 8033: This patch adds print slips to self checkout.

To Test:

Sign in to self checkout.
Enter a barcode and click submit.
Click the finish button
You should be prompted with a message asking if you would like a receipt.
If you click OK you should be taken to the page with the receipt.
If you click Cancel you should not see the reciept and you should be logged out.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Added copyright to print slip for SCO

Modified POD and copyright.  Also perltidied

updated print slip option to show on the click of the finish button instead of the submit button

Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Elliott Davis <elliott@bywatersolutions.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>