Bug 11015: add copyright headers to some files

This patch adds a copyright headers where they didn't exist in the Koha
namespace.

Signed-off-by: Robin Sheat <robin@catalyst.net.nz>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>