Bug 28418: Show template_id of MARC modification templates

Bug 28418: Show template_id of MARC modification templates

This patch adds an "id" column to the table of MARC modification
templates. The table is now a DataTable with table settings, with the
new column hidden by default to preserve the existing configuration.

To test, apply the patch and restart services.

 - Go to Administration -> MARC modification templates.
 - If necessary, add two or more templates.
 - Confirm that table of templates displays as a DataTable, with all
   associated sorting, filtering, export, etc.
 - The "id" column should be hidden by default.
 - Confirm that column visibility controls work correctly.
 - Confirm that the table settings found under Administration -> Table
   settings work correctly to set the default visibility of the table
   columns.

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>