ast.sml and astTest.sml, finished data expression implementation for Read and Convert.
Also made StmtSeq a list of statements instead of a pair.
wavebench now compiles and runs on mac again.  Don't actually need omp.h.
Merge branch 'master' of https://github.com/mn200/inspector-strategies
Finished cleaning up environment interface by creating value datatype.
Merge branch 'master' of https://github.com/mn200/inspector-strategies