Bug 14031: Itemnumber should be a numeric search in ccl.properties

Bug 14031: Itemnumber should be a numeric search in ccl.properties

This patch changes the "itemnumber" alias so that it acts like
"itemnumber,st-numeric". That is, it always does a numeric search.

_TEST PLAN_

The best way to test this patch is to apply the patch and then run
"make upgrade", I suspect. As this will refresh your "ccl.properties".

However, this patch is actually really small, so you can just apply
it manually to an existing "ccl.properties" if you rather save time.

Basically, you just need to do the following steps:

0) Do a search for "itemnumber:<insert real indexed itemnumber here>"
1) Note that you can't retrieve any results
2) Change your ccl.properties to say "itemnumber 1=8010 4=109"
3) Repeat the search for "itemnumber:<X>"
4) Note that you now retrieve your result

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Tested on a gitified package install. Made the change to
/etc/koha/zebradb/ccl.properties manually. After this change
I can successfully search for "itemnumber:1".

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>