parallelize test suite

[Daniel Kahn Gillmor]

On Sat 2019-05-04 20:57:43 +0000, Rollins, Jameson wrote:
> This is a simple patch series that will run the entire test suite in
> parallel if either the moreutils or GNU parallel utility is
> available.  On my 8-core machine the full test suite will now run in
> under 20 seconds, which is a pretty huge improvement.

I've reviewed this series, and it is a *very* nice cleanup; the latency
reduction makes it much more pleasant to develop notmuch safely.

My computer is weaker than jamie's (i have an older 4-core i5
processor), but with this series applied, the test suite went from 1m48s
to 0m29s for me.

Please apply this series!

       --dkg
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