tests/invalid

[Fergus Henderson]

Zoltan Somogyi, you wrote:
> 
> It seems that when I added the runtests files for all the subdirectories
> in tests, I did not add one for invalid (even though the log message says
> I did). As a consequence, our tests since then have not exercised the tests
> in this directory. This change
> 
> - adds the runtests file
> - adds the test case qual_basic_test2 (removed from hard_coded a while ago)
> - fixes up several err_exp files that have suffered bit rot
> 
> There are some other tests cases with bit rot for which I don't know the
> real expected output; I have temporarily made these tests inactive.
> 
> There is also a formatting change in tests/benchmarks.

That looks fine; please commit it.

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