HoTT/coq bug #7 is closed, and the definitions can be made to go through using explicit
universes. The behavior of Hint Rewrite still differs from Hint Resolve though.
Fix HoTT/coq bug # 14. Now coercion code correctly raises an error instead of an anomaly in case
a universe inconsistency occurs when applying a coercion. The statement of the test-suite file
cannot check as is, but does check when the correct FunctorCategory is given, instantiating the TypeCat
to Set.