Bug 10687: Delete erroneous tags 68a and 68b on default MARC21 auth framework

This patch deletes information for default
MARC21 auth framework on tags 68a and 68b.
Also added update for current installs.

RM note: The 68a and 68b fields were defined in an attempt to include
both MARC21 classification and MARC21 authority records in the same
default framework, but I don't think this has turned out to be useful,
as to my knowledge nobody tries to use MARC21 classification records
in Koha, and if one were to want to, a distinct record type (or at
least auth_type) would be a better way to do it.

To test with current authorities_normal_marc21.sql loaded

1) apply the patch
2) run updatedatabase
3) check on database that there are no more
references to tags 68a and 68b

To test for new installs
1) remove auth frameworks
2) load authorities_normal_marc21.sql
3) check that load without problem
4) check on database that there are no more
references to tags 68a and 68b

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Paola Rossi <paola.rossi@cineca.it>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 10687: (follow-up) remove authority 68a/68b tags from translated MARC21 framework scripts

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 10687: DBRev 3.13.00.022

Signed-off-by: Galen Charlton <gmc@esilibrary.com>