Bug 27947: Add cancellation reason to article request

Bug 27947: Add cancellation reason to article request

This bug adds a cancellation reason authorised values to article requests

To test:
1. apply this patch
2. updatedatabase
3. in staff interface go to /cgi-bin/koha/admin/authorised_values.pl
CHECK => AR_CANCELLATION category should appears
4. place several article requests
5. in staff interface go to /cgi-bin/koha/circ/article-requests.pl
6. select multiple requests, or just one and cancel them
SUCCESS => a modal pops up offering to select a cancellation reason
CHECK => message_queue table has messages with cancellation reason included
7. repeat steps 4 to 6 but for /cgi-bin/koha/circ/request-article.pl
8. cancelling article requests from opac interface should work just as before

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>