Bug 16545 - Make edit link a styled button in item search results

Bug 16545 - Make edit link a styled button in item search results

This patch replaces the item search results "edit" link with a dropup
button which offers "Edit item" and "Edit record" links.

To test, apply the patch and perform an item search. Each results should
have an "Edit" menu. Confirm that the menu links work correctly for
items on more than one page.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>