[m-rev.] diff: clean up typeclass parsing

[Ralph Becket]

> 
> Index: compiler/prog_io_typeclass.m
> ===================================================================
> +:- type arbitrary_constraint
> +	--->	simple(prog_constraint)
> +			% A class constraint whose arguments are either
> +			% variables or ground terms.
> +
> +	;	class(prog_constraint)
> +			% An arbitrary class constraint not matching the
> +			% description of "simple".

Wouldn't complex or non_simple be a better name than class?

Otherwise that looks fine.

-- Ralph
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