Bug 29185: Facilitate searching for cnum

Bug 29185: Facilitate searching for cnum

Instead of typing the case sensitive Control-number each time.
4 strikes instead of 15 on your keyboard. Wow! Gain of 73%.

Test plan:
Copy ccl.properties to /etc/koha/zebradb, restart Zebra and
search for cnum=SOME_ID in opac or intranet.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>