Bug 16522: Adding 773 to cart and list displays and emails

Bug 16522: Adding 773 to cart and list displays and emails

This enhancement adds information from a host item entry and a link if
applicable to the host record in the following places:
- staff client list
- staff client cart
- staff client send list email
- staff client send cart email
- staff client search results
- staff client detail page
- opac list
- opac cart
- opac send list email email
- opac send cart email
- opac search results
- opac detail page

To test:

1. apply patch, restart services
2. log into the staff client and enable the syspref EasyAnalyticalRecords
3. find a record with an item. take note of the barcode.
4. go to another record (biblio 2). click Edit -> Link to host record
5. enter the barcode in the input and submit.
6. click the MARC tab and confirm the host record has been linked under
MARC field 773.
7. add biblio 2 to your cart, and to a list.
8. go to your cart. confirm you see the 'host item entry' link.
9. click on 'more details' and confirm you see the 'host item entries'
link.
10. click 'send' to email the cart. confirm the email contains the host
item entry and the link sends you to the catalogue page for the record
in the OPAC.
11. go to the list you added the record to. confirm you see the 'source'
link for the host item entry.
12. click 'send list' to email the list. confirm the email contains the
host item entry and the link sends you to the catalogue page for the
record in the OPAC.
13. log into the OPAC. repeat steps 7 to 12 on the OPAC and confirm they
all pass as expected.
14. Confirm host item info also shows correctly on the
OPAC and staff client search results, and the OPAC and staff client
detail pages (where XSLT is used)
15. Delete the 773$w and confirm host item info still shows correctly
but no longer links to biblio
16. confirm tests pass t/db_dependent/Koha/Biblio/host_record.t

Sponsored-by: Bibliotheksservice-Zentrum Baden-Württemberg (BSZ)
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>