PathSplit maps as another variety of equivalence
Use pointwise pathsplitness in reflective subuniverses
build repleteness into UnitSubuniverses
start the recursion in PathSplit at a more sensible place
add universe annotations to modalities etc.
some more useful lemmas
collect Extensions in their own file
Localization is a reflective subuniverse
Accessible subuniverses and modalities
Nullification modalities
improve comments
fix comment typos
comment improvements
consistent use of IsLocal and IsNull local notations
move ooextendable_isnull_fibers to Extensions.v
avoid inexcusably slow typeclass inference
put funext hypotheses explicitly where they occur in Extensions.v
make Op' not depend on funext
Merge pull request #603 from mikeshulman/localization

Universal properties without funext, and localization