[m-rev.] for review: allow dd answers to be revised

[Mark Brown]

On 11-Nov-2002, Mark Brown <dougl at cs.mu.OZ.AU> wrote:
> Estimated hours taken: 60
> Branches: main
> 
> Allow users of the declarative debugger to revise answers that they
> have given previously.

I've committed this change now, since it will otherwise conflict
with something else I want to start working on.  I'll address any review
comments in a separate change.

Cheers,
Mark.

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