Export StrictMVar module, add readMVar variable
Export LocalNode and LocalNodeState constructors for debugging purposes
add explicit LANGUAGE pragmas instead of relying on defaults in .cabal config

This makes it much easier to traverse the code in ghci from other projects using d-p.
add explicit LANGUAGE pragmas instead of relying on defaults in .cabal config (pt2)

This makes it much easier to traverse the code in ghci from other projects using d-p.