menhir parser: factorize indexing sugar and remove macros array_*, bigarray_*
menhir parser: factorize indexing sugar and remove macros array_*, bigarray_*

gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml,gerdstolpmann/ocaml