The directory server now has two node ttts (configurable). Defaults to three hours and two weeks. The first one is used to mark a node as 'not published', i.e. it will not returned as a possible neighbour node to a new node member. When second hard node ttl triggers the node will be completely removed from the directry server db (with public key and all). An experimental configurabe has also been added to the directory server. It enables the experimental directory server api, i.e. get_nettwork_topology() and reserved_oas().