Bug 12533: Improve authority search result display

Bug 12533: Improve authority search result display

This patch implements a few changes in the way authority records are
displayed in search results.

- In most cases heading type is now displayed as a separate column in
  the table of search results.
- The heading itself is now linked rather than a separate "details"
  link.

In the authority search results for MARC editor plugins the heading link
triggers a modal with the authority details instead of linking to a
separate page.

To test, apply the patch and go to Authorities.

- Perform an authority search which will return results.
- In the search results headings should be linked to the
  corresponding detail page.
- There should be a separate column for heading type.
- Go to Cataloging and create a new record using a framework which has
  a field linked to an authority type (e.g. 100a -> PERSO_NAME ).
- Perform a search which will return results.
- In the search results, clicking a heading link should trigger a
  modal window with the authority details.
- Test multiple entries in the results and confirm that each
  time the correct data is loaded into the modal window.
- Test the same process for a field which is linked to the
  unimarc_field_210c.pl plugin.
- Go to Tools -> Batch record modification and submit multiple
  authority record numbers.
- In the results list the heading should be linked correctly to the
  corresponding detail page. Heading type is not present in this
  view.
- Perform the same test with batch record deletion.

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Marjorie Barry-Vila <marjorie.barry-vila@collecto.ca>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>