OpamConfigCommand

`sig val env : csh:bool -> sexp:bool -> fish:bool -> inplace_path:bool -> unit val list : OpamTypes.name list -> unit val variable : OpamTypes.full_variable -> unit val subst : OpamTypes.basename list -> unit val setup : OpamTypes.user_config option -> OpamTypes.global_config option -> unit val setup_list : OpamTypes.shell -> OpamTypes.filename -> unit val exec : inplace_path:bool -> string list -> unit end`