by address reference
* add a one-to-many link between address and address reference;
* update AddAddress.vue to add information on picked address reference;
* add an HouseholdACLAwareRepository, with a method to find household by
current address reference
* add an endpoint to retrieve household by address reference
* + tests
edit context: display country for existing address
new context: repair editPane, load countries
note: adding id for country and postcode in address endpoint json
