* Update tests.patch
* release.nix fixes for building and running cabal test suite from inside the nix-shell environment
* Update build instructions
* More README updates
* Fix stack tooling and improve documentation
* Update grpc sha256, cleanup build instructions
* Whups, DYLD_LIBRARY_PATH and substituteInPlace is still needed for hydra / macos builds with no brew-installed grpc!
* PR feedback tweaks