Bug 18098: Add an index with the count of not onloan items

Bug 18098: Add an index with the count of not onloan items

This patch adds a numeric index 'not-onloan-count' containing the value
of 999$x. This subfield is filled by 'rebuild_zebra.pl' by making use of
(bug's 18208) 'EmbedItemsAvailability' filter.

bib1.att and indexes definitions are updated accordingly.

To test:
- Apply the patch
- Pick the right biblio-zebra-indexdefs.xsl file for your setup and
  replace the one your Zebra uses [1]
- Replace your bib1.att
- Replace your ccl.properties
- Have at least one record with more than one item, checkout some
  item(s) from that record(s).
- Rebuild zebra's indexes:
  $ sudo koha-shell kohadev
 k$ cd kohaclone
 k$ misc/migration_tools/rebuild_zebra.pl -r -b -v -k
 (notice the dump directory is kept, you can try the XSLT yourself
  running:
    $ xsltproc \
       etc/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl \
       /tmp/the_dump_dir/biblios/exported_records | less
=> SUCCESS: There are records with the not-onloan-count index, and the
            value is correct!
- Check Zebra yourself:
  $ yaz-client unix:/var/run/koha/kohadev/bibliosocket
 Z> base biblios
 Z> find @attr 1=9013 @attr 2=5 @attr 4=109 0
=> SUCCESS: The search matches the amount of records with not-onloan
            items.
 Z> s 1+1
=> SUCCESS: Records with 999$x having a value higher than 0 are rendered
- Sign off :-D

Note: While this work is complete on its purpose, it is part of an
attempt to create a better way of filtering by availability.

Sponsored-by: ByWater Solutions
 [1] In kohadevbox this would be
/etc/koha/zebradb/marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl

Edit: Added the missing XSLT changes for UNIMARC and NORMARC

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>