(* NCicLibrary.add_constraint adds the constraint to the NCicEnvironment
* and also to the storage (for undo/redo). During inclusion of compiled
* files the storage must not be touched. *)
(* NCicLibrary.add_constraint adds the constraint to the NCicEnvironment
* and also to the storage (for undo/redo). During inclusion of compiled
* files the storage must not be touched. *)