Bug 20350: Add column configuration to table of saved reports

Bug 20350: Add column configuration to table of saved reports

This patch makes changes to the saved reports template to enable a
columns configuration button. Settings for the table have been added to
columns_settings.yml.

To test, apply the patch and go to Reports -> Use saved.

 - Confirm that there is a "Column visibility" button in the
   table's pagination toolbar.
 - Confirm that showing and hiding columns via the button is working
   correctly.
 - Confirm that the first, second, and last columns cannot be toggled.

Go to Administration -> Columns settings.

- Expand the "Reports" section.
- Find "id=table_reports."
- Make some selections to configure default settings of the reports
  table.
- Return to reports and confirm that these defaults are applied.

Signed-off-by: Jesse Maseto <jesse@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>