Bug 19939: Move cataloging Z39.50 results actions into menu

Bug 19939: Move cataloging Z39.50 results actions into menu

This patch modifies the template which displays cataloging Z39.50
search results so that the "MARC," "Card," and "Import" links are moved
out of separate table cells and into one menu.

The old menu which would appear when any table cell is clicked has been
removed, and code added to display the same Bootstrap menu if a table
cell is clicked.

To test, apply the patch and go to Cataloging -> New from Z39.50/SRU.

- Perform a Z39.50 search which will return more than one result.
- Confirm that clicking the "Actions" button triggers a drop-down menu.
  - Confirm that the links in the menu trigger actions for the correct
    bibliographic record.
- Confirm that clicking any other table cell in the table of results
  will trigger the display of the same menu.
  - Confirm that this menu works correctly for the correct record.

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>