Bug 17435: Gives ability to display stocknumber in search results

Bug 17435: Gives ability to display stocknumber in search results

Adds stocknumber to data provided for xslt transformation

Test plan :
1) go to Administration module, MARC default frameworks and add, if not already done, a stocknumber subfield (a priori under the 995 tag). It will be linked to items.stocknumber in the koha.link zone of Advanced constraints section.
2) edit an item in staff interface and add a number in the stocknumber field.
3) Edit the xslt opac Results file that you are using and customize it. For a basic test, you can just replace "itemcallnumber" occurrences by "stocknumber".
4) make a search in a way to get several results including the title from which you modified an item.
5) You will see the added stocknumber displayed (between square brackets in the default xslt).

Same can be done through staff interface and staff xslt files.

Olivier Crouzet

Signed-off-by: Hector Castro <hector.hecaxmmx@gmail.com>
Signed-off-by: Katrin Fischer  <katrin.fischer@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit f74e467550c4d6f6e8e9becdc61b7df572de5f09)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>