Bug 12747: Add extra column in Z3950 search

Bug 12747: Add extra column in Z3950 search

This patch makes it possible to add an extra column to Z3950 search results.
The system preference AdditionalFieldsInZ3950ResultSearch decides which MARC field/subfields are displayed in the column.

Testing:

I Apply the patch
II Run updatedatabase.pl

ACQUISITIONS
0) Enter a field/subfield in the AdditionalFieldsInZ3950ResultSearch
1) Create a new basket or use an existing one
2) In -Add order to basket-, click "From an external source"
3) Select some search targets and enter a subject heading ex. house
4) Click Search bouton
5) Validate "Additional fields" column with the field/subfield value.

CATALOGUING
0) Shares same syspref as above
1) Go to cataloguing, click New from z3950
2) Fill to result in a successful search
3) Validate column Addition Fields

prove t/db_dependent/Breeding.t

Sponsored-by: CCSR (https://ccsr.qc.ca)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>