Bug 14423 : XSS in authorities-home

Bug 14423 : XSS in authorities-home

To test:
1/ Hit a url like http://localhost:8081/cgi-bin/koha/authorities/authorities-home.pl?op=do_search&type=intranet&marclist=mainentry&and_or=and&operator=contains&value=%22/%3E%3Cscript%3Ealert%28%27oh%20noes%27%29%3C/script%3E
2/ Notice you get 3 alert boxes
3/ Apply patch
4/ Hit the url again, no js

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>