Bug 14766: Complete cataloguing plugin unimarc_field_4XX

Bug 14766: Complete cataloguing plugin unimarc_field_4XX

Add subfields l, n and o for better UNIMARC compliance

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Note: I just did a code audit here, as I don't know enough about
UNIMARC to know if the 4XX fields should have these subfields.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 503dd6036974b4208bd5cd60a87bb28599987f45)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
(cherry picked from commit 84ee44110a934632ddcc8da59aa805c45a79786e)
Signed-off-by: Liz Rea <wizzyrea@gmail.com>