Bug 9940: Add a new index for the original language of a document

Bug 9940: Add a new index for the original language of a document

It could be useful to index the original language of a document (i.e.
"fre" for the English translation of a French novel).

This patch renames the Bib-1 use attribute 1095 from
Code-language-original to language-original and uses it to index:

- MARC21 041$h subfield
- UNIMARC 101$c subfield

It adds "language-original" in the list of index in Search.pm.

Test plan :
A. in a MARC21 GRS1 environment
1. Copy Zebra config files (zebradb/biblios/etc/bib1.att,
   zebradb/ccl.properties, marc_defs/marc21/biblios/record.abs) from
   your source etc/ directory to your main koha etc/ directory
2. Reindex zebra
3. Make some searches, like "language-original:fre"
B. in a MARC21 DOM environment
4. Copy Zebra config files (zebradb/biblios/etc/bib1.att, zebradb/ccl.properties,
   marc_defs/marc21/biblios/biblio-zebra-indexdefs.xsl) from your source etc/
   directory to your main koha etc/ directory
5. Reindex zebra
6. Make some searches, like "language-original:fre"
C. in a UNIMARC GRS1 environment
7. Copy Zebra config files (zebradb/biblios/etc/bib1.att,
   zebradb/ccl.properties, marc_defs/unimarc/biblios/record.abs) from
   your source etc/ directory to your main koha etc/ directory
8. Reindex zebra
9. Make some searches, like "language-original:fre"
A. in a UNIMARC DOM environment
10. Copy Zebra config files (zebradb/biblios/etc/bib1.att,
    zebradb/ccl.properties, marc_defs/unimarc/biblios/biblio-zebra-indexdefs.xsl)
    from your source etc/ directory to your main koha etc/ directory
11. Reindex zebra
12. Make some searches, like "language-original:fre"

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit 451f67c05593461d2756a161032c39113d282c25)
Signed-off-by: Fridolin SOMERS <fridolin.somers@biblibre.com>