include predicate as redundant data in UnitSubuniverse
include induction principle as redundant data in Modality
make that bit of Freudenthal work
remove "using n" to make the proofs work.
revert some Univalences to Funexts
remove nearly all univalence in ReflectiveSubuniverse and Modality
Merge pull request #493 from mikeshulman/modalitydata

Include useful redundant data in modalities