Bug 11232: UNIMARC facet definition and updated XSL file for DOM

Bug 11232: UNIMARC facet definition and updated XSL file for DOM

This patch adds the facets definitions to the biblio-koha-indexdefs.xml, based
on what is hardcoded on C4::Koha::getFacets().

The biblio-zebra-indexdefs.xsl file for UNIMARC is generated using the usual:

xsltproc ...koha-indexdefs-to-zebra.xsl ...unimarc/biblios/biblio-koha-indexdefs.xml > \
    ...unimarc/biblios/biblio-zebra-indexdefs.xsl

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: David Cook <dcook@prosentient.com.au>
Seems to work with DOM and MARC21.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>