Bug 32256: Enable batch checkout using self-checkout

Bug 32256: Enable batch checkout using self-checkout

This patch allows more than one item to be scanned and processed at once in Koha's self-checkout module. The items in the batch will still be handled one-by-one, so if any item in the batch requires confirmation (i.e. to be renewed or returned) or is impossible to check out, the process will stop at that item. Any items earlier in the list will be processed, but any items coming after in the list will be ignored. This feature uses the existing BatchCheckouts and BatchCheckoutsValidCategories system preferences to determine if batch checkouts should be allowed.

To test:
1) Open the staff interface. Go to Koha Administration -> Global system preferences. Search for "BatchCheckouts". Confirm BatchCheckouts syspref is disabled, and no categories are selected for the BatchCheckoutsValidCategories syspref.
2) In another tab, open the OPAC self checkout (found out OPACBaseURL/cgi-bin/koha/sco/sco-main.pl) and log in
3) Confirm the self-checkout works as normal for checking out, returning or renewing one item at a time
4) Go back to the staff interface tab (you may need to log back in). Enable the BatchCheckouts syspref but leave the BatchCheckoutsValidCategories syspref empty.
5) Refresh the OPAC self checkout tab. The barcode input field will now be bigger to support a list of barcodes. Enter a list of barcodes separated by newlines and Submit.
6) Only the first barcode should be processed. This is because no categories are valid for BatchCheckouts.
7) Go back to the staff interface tab (you may need to log back in). Select at least your patron category for the BatchCheckoutsValidCategories syspref and Save.
8) Refresh the OPAC self checkout tab. Enter a list of barcodes separated by newlines and Submit. Confirm all valid items are checked out as expected.
9) Test with a few items that are notforloan or would not be valid checkouts. Confirm they are not checked out, but other valid items in the batch are checked out successfully.
10) Test with a batch where one of the items is already checked out to the patron. The batch should get blocked at this item as the self-checkout asks for confirmation.
11) Test with both renewing and returning of items that are already checked out to the patron. This will only work with one item at a time and later items in the list will be ignored.

Sponsored-by: Koha-US
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Andrew Fuerste Henry <andrewfh@dubcolib.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Andrew Fuerste Henry <andrewfh@dubcolib.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>