OCaml implementation of operations in Program Algebra

Taddeus Kroes 23418c16e1 Added better error checking 11 gadi atpakaļ
.gitignore 9340893b20 Added basic PGA parser and printer 11 gadi atpakaļ
Makefile 9340893b20 Added basic PGA parser and printer 11 gadi atpakaļ
parse.ml 23418c16e1 Added better error checking 11 gadi atpakaļ
pga.ml 23418c16e1 Added better error checking 11 gadi atpakaļ
stringify.ml 23418c16e1 Added better error checking 11 gadi atpakaļ
types.ml 23418c16e1 Added better error checking 11 gadi atpakaļ