Bug 28166: Optionally add MARC fields to authority search

Bug 28166: Optionally add MARC fields to authority search

adds the same feature to Authority Search as in the "normal" Z39.50 search, to display
arbitrary marc fields in the search results

1. apply patch
2. go to System preferences->Authorities preferences
3. the new option "AdditionalFieldsInZ3950ResultAuthSearch" shows up
4. enter the additional field numbers you want to see eg '001'
5. make an "Authority" search via Z39.50
6. the new new column "Additional fields" will display
7. sign off ;-)

Sponsored-by: Steiermärkische Landesbibliothek
Signed-off-by: Laura Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: Clemens Tubach <clemens.tubach@kit.edu>
Bug 28166: Removed comments and _add_rowdata

Bug 28166: (follow-up) Restore custom fields for biblios

To test:
1 - Add "245$a" to AdditionalFieldsInZ3950ResultSearch preference
2 - Cataloging -> new from z3950
3 - Search and see results have 'additional fields' including the title
4 - Apply other patches
5 - Restart all
6 - Repeat Z39 Additional fields are now blank
7 - Apply thi patch, restart all
8 - Repeat Z39 search. Additional fields are restored

Bug 28166: (QA follow-up) Fix rebase issue

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