As a user, I want to be notified when an incident is created for me. Users should not be able to unsubscribe from the notification.
1. Set the notification "Incident opened for me" to be mandatory. (Note: 'The mandatory' field may need adding to the form). A user should get a notification even if they created an incident for themselves.
2. Update the "incident_has_been_opened" mail script so that the message contains the "Opened by" user information.