Reimplement Unix.command like Unix.create_process
Reimplement Unix.command like Unix.create_process

Avoid calling Unix.fork and use the new "spawn" primitive, for efficiency
and for improved compatibility with threads and Multicore OCaml.

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