[m-rev.] for review: Fix failing tabled_typeclass test case.

[Zoltan Somogyi]

On Tue, 07 Aug 2018 11:37:14 +0200 (CEST), "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> > (Being able to lift the default limit, as in
> > the declarative debugger, would suffice as well.)
> 
> I will fix that.

The attached diff, which I just committed, does that. I would welcome
a review from anyone, especially of the changes to the documentation.

A question: mdb accepts "print action" and "print io" as being synonyms.
The documentation mentions only the former, while the tests use
the latter. Should we document both, should we replace both with
"print io_action", or is there some better name for this command?

Zoltan.
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