Bug 19805: Add DataTables to Koha to MARC mapping page

Bug 19805: Add DataTables to Koha to MARC mapping page

This patch adds sorting and filtering to the Koha to MARC mapping table
using DataTables.

Also changed: Font awesome icons on "Add" and "Remove" buttons; Minor
markup correction to breadcrumbs.

To test, apply the patch and go to Administration -> Koha to MARC
mapping.

- Table should be sorted by default on Koha field.
- Sorting and filtering should work correctly.

Signed-off-by: Simon Pouchol <simon.pouchol@biblibre.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>