[m-rev.] for review: implement arg_cc in Mercury

[Ralph Becket]

Peter Ross, Monday,  2 December 2002:
> 
> library/std_util.m:
> 	Introduce a new type maybe_arg which is returned by arg_cc to
> 	return its result.  Change arg_cc to have the correct
> 	determinism and type signature.  Add utility predicates which
> 	allow us to construct values of the maybe type from a foreign
> 	language.

I think maybe_some would be a better name than maybe_arg.

- Ralph
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