[m-rev.] diff: fix error message for instances

[Ralph Becket]

Mark Brown, Wednesday,  3 August 2005:
> This is in response to the problem reported by Peter Schachte.
> 
> Cheers,
> Mark.
> 
> Estimated hours taken: 0.2
> Branches: main, release
> 
> compiler/prog_io_typeclass.m:
> 	Report a more useful error if the arguments of an instance are not
> 	in the required form.  The error term is now the entire head of the
> 	instance, which has a meaningful context.

Looks good.
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