Bug 14423: Multiple XSS bugs in suggestion.pl

Bug 14423: Multiple XSS bugs in suggestion.pl

To test
1/ Hit a url like http://localhost:8081/cgi-bin/koha/suggestion/suggestion.pl?author=%22%3E%3Cscript%3Ealert%28%27oh%20noes%27%29%3C/script%3E&accepteddate_to=
2/ Notice alert box(es)
3/ Apply patch
4/ Reload and notice alert is gone

Repeat for
collection_title
copyrightdate
isbn
manageddate_from
manageddate_to
publishercode
suggesteddate_from
suggesteddate_to

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>