Bug 16522: (follow-up) MARC display templates and get_marc_host fixes

Bug 16522: (follow-up) MARC display templates and get_marc_host fixes

Also:
- Show related parts 773$g
- Normalise using 'Host item entry' as title
- Remove 'foreach' because non-xslt views only return first
- If no $w, use $atg, and related tests in
t/db_dependent/Koha/Biblio/host_record.t

Signed-off-by: Heather Hernandez <heather_hernandez@nps.gov>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>