Bug 4366: Improve COinS support for MARC21

Bug 4366: Improve COinS support for MARC21

This patch begins the process of improving the COinS support in Koha to take
advantage of all the metadata available in the MARC format. COinS still doesn't
work quite right, but at least it seems to be following the standard now. The
COinS exported by C4::Biblio::GetCOinSBiblio now correctly identifies articles
from journals and books as such.

Signed-off-by: Jared Camins-Esakov <jcamins@bywatersolutions.com>
Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>