Bug 26708: Add SQL popup when hovering over name of report

Bug 26708: Add SQL popup when hovering over name of report

This patch adds an option to preview a report's SQL by selecting
"Preview SQL" from the "Actions" menu.

To test, apply the patch and go to Reports -> Saved reports.

 - In the table listing saved reports, open the "Actions" pop-up menu
   and click the "Preview SQL" link.
 - You should be shown a modal with a syntax-highlighted view of the SQL
   code.
 - The footer of the modal should have options for Edit, Duplicate,
   Schedule, Delete, Run report, and Close.
 - Test that all these buttons work correctly.
 - Test that all of these features work correctly any page of the saved
   reports DataTable.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>