#status as 'status -> NCic.universe -> NCic.universe -> 'status
val aliases_of: NUri.uri -> NReference.reference list
val resolve: string -> NReference.reference list
+(*
(* warning: get_obj may raise (NCicEnvironment.ObjectNotFoud l) *)
val get_obj: #NCic.status -> NUri.uri -> NCic.obj (* changes the current timestamp *)
+*)
val time_travel: #status -> unit
+val replace: #status -> unit
val init: unit -> unit