Mess around with firsthit stuff and chains
Make some atomic modifies strict.  Expose IMapSnap from SLMap
Optimization: use Shachaf's traverseWithKey_ for Maps.
untested: tweak SLMap.hs to have a constant-time freeze operation
Expose more operations on frozen SLMaps
Bump version
Working on DeepFreezable.  Attempt FreezableTuple type.  Stuck presently.
Nix FreezableTuple.  Bite the bullet and expose DeepFreezable2/3
Refactor DeepFreeze into a separate module
Refactor benchmarks and PBBS to their own dirs
Remove hsbencher submodule
Add README.md to haskell-prototype dir.