Bug 29990: Show authority appropriate heading use on search results

Bug 29990: Show authority appropriate heading use on search results

Authority heading use is based on authority MARC 008/14-16. This could
be useful to show on authority search results, if new system preference
ShowHeadingUse is enabled.

To test:

1. Apply patches, update database, restart services
2. Go to Koha Administration -> system preferences -> searching tab.
Notice new ShowHeadingUse system preference is disabled. Leave it
disabled for now.
3. Do an authority search. Confirm it works as expected and no new
information is shown since ShowHeadingUse is disabled.
4. Do a biblio search and edit a record. Go to one of the authority
fields (1xx, 6xx or 7xx) and launch the authority finder plugin. Do an
authority search and confirm it works as expected and no new information
is shown since ShowHeadingUse is disabled.
5. Go back to system preferences and enable ShowHeadingUse syspref.
6. Repeat steps 3 and 4 but confirm the 'Heading use' column now shows, and
correctly displays what the heading can be used for based on 008/14-16.

Sponsored-by: Education Services Australia SCIS
Signed-off-by: Jessica <jzairo@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>