Bug 17547: (MARC21|NORMARC) have Chronological term field $9 indexed

Bug 17547: (MARC21|NORMARC) have Chronological term field $9 indexed

This patch makes Zebra index the 648$9 link for chronological terms on
bibliographic records. This way an authority search on chronological terms
will show the right number in 'Used in X records' message.

To test:
- Have a record with a 648 field, linked to an authority record (i.e. with an authid on 648$9).
- Search for the record, notice it is indexed.
- Perform an authority search for the chronological term
=> FAIL: the term is linked to our record, but koha shows '0' count.
- Apply the patch
- Run:
  $ cd kohaclone
  $ xsltproc etc/zebra/xsl/koha-indexdefs-to-zebra.xsl \
       etc/zebradb/marc_defs/marc21/biblios/biblio-koha-indexdefs.xml \
     > etc/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl
  $ git diff
=> SUCCESS: Notice the shipped etc/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl
   is up-to-date
- Run:
  $ sudo cp etc/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl \
            /etc/koha/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl
  $ sudo koha-restart-zebra kohadev
  $ sudo koha-rebuild-zebra -f -b -v kohadev
- Search for the record, notice it is indexed.
- Perform an authority search for the chronological term
=> SUCCESS: the term is linked to our record, usage count is 1
- Sign off :-D

I assume NORMARC is similar on this regard. Feel free to fail it if the NORMARC part of the
patch is wrong.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: Hugo Agud <hagud@orex.es>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>