- Now imports Fun rather than Orderings - Moved "Set as lattice" section behind "Fun as lattice" section, since   sets are just functions. - The instantiations     instantiation set :: (type) distrib_lattice     instantiation set :: (type) complete_lattice   are no longer needed, and the former definitions inf_set_eq, sup_set_eq,   Inf_set_def, and Sup_set_def can now be derived from abstract properties   of sup, inf, etc.
- Now imports Fun rather than Orderings
- Moved "Set as lattice" section behind "Fun as lattice" section, since
  sets are just functions.
- The instantiations
    instantiation set :: (type) distrib_lattice
    instantiation set :: (type) complete_lattice
  are no longer needed, and the former definitions inf_set_eq, sup_set_eq,
  Inf_set_def, and Sup_set_def can now be derived from abstract properties
  of sup, inf, etc.

MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle,MerelyAPseudonym/isabelle