Bug 14472: Wrong ISSN search index in record matching rules

Bug 14472: Wrong ISSN search index in record matching rules

To Test
---------
 1) Apply the patch
 2) Export some MARC bibliographic records from Koha
 3) Import those same MARC bibliographic records using the
    "ISSN(022$a)" record matching rule.
 4) The incoming records should match perfectly
 5) Check the mysql tables (marc_matchers, matchpoints,
    matcher_matchpoints, matchpoint_components,
    matchpoint_component_norms) to make sure the values were
    inserted as expected.
For new Koha installation
 1) create the koha database
 2) Go to the staff client page, and do a "fresh" install making
    sure to select lots of optional marc 21 matching rules so
    the .../marc21/optional/marc21_default_matching_rules.sql
    gets triggered.
 3) Check the mysql tables (marc_matchers, matchpoints,
    matcher_matchpoints, matchpoint_components,
    matchpoint_component_norms) to make sure the values were
    inserted as expected.

Bug 14472 - Added Atomic Update to fix wrong issn search index

    - Fix comments

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>