Bug 7700: Cart's more details view shows identity numbers

Bug 7700: Cart's more details view shows identity numbers

We already remove $9 with Koha's authority number from output
of GetMarcSubjects and GetMarcAuthors.
Patch additionally removes $0 subfields with identity numbers.

Patch also effects detail pages with normal (non-XSLT) views.

Revised to always remove $0 subfields, they are not used in UNIMARC.

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>