tuned;

clarified deps entry: global names for arguments;

renamed Defs.node to Defs.item; clarified type Defs.item; clarified item_ord for printing;

tuned signature;

tuned whitespace;

HOL typedef with explicit dependency checks according to Ondrey Kuncar, 07-Jul-2015, 16-Jul-2015, 30-Jul-2015; defs.ML: track dependencies also for type constructors; typedef.ML: add type defined by typedef to dependencies, Abs and Rep now depend on the type; Pure types and typedecls are final -- no dependencies;

prove Liminf_inverse_ereal