Update Group1DatabaseCreation.sql

Added update cascade and delete restrict to:
- ns_ilo_inumkey, ns_ilo_ialphakey, ns_ilo_ilomuseumkey_item
- ns_ilo_locname, ns_ilo_museumkey_location
- ns_lodor_locname_entrance, ns_lodor_museumkey_entrance
- ns_lodor_locname_exit, ns_lodor_museumkey_exit
- ns_ex_ename, ns_ex_showdate_start
- ns_exl_locname, ns_exl_museumkey