Add Data.String to base-pure (without 'words')
Disable GHC.Constants, does not build easily outside the GHC tree
Add Data.Char and GHC.Unicode to base-pure
ignore dist in verify-split.pl
Add Read and related infrastructure to base-pure
Add commented Read instances
Add Control.Monad.Zip to base-pure
Add Prelude.Pure

as the subset of Prelude that is provided by base-pure
Create base-st package
Remove ST from base-io
Add base-concurrency