added lemmas; uniform names --HG-- rename : src/HOL/Data_Structures/Priority_Queue.thy => src/HOL/Data_Structures/Priority_Queue_Specs.thy
qualify interpretations to avoid clashes
more abstract names
more name tuning --HG-- rename : src/HOL/Data_Structures/Map_by_Ordered.thy => src/HOL/Data_Structures/Map_Specs.thy rename : src/HOL/Data_Structures/Set_Interfaces.thy => src/HOL/Data_Structures/Set_Specs.thy