There were issues in trying to do CPU tuning (see #279 and #157 for
examples).
The simpler approach, given the capacity of modern hardware and the
antiquity of OpenPGP's S2K parameters, is just to always use the
maximum S2K settings. This also saves us some CPU from running
calibration steps.
This commit also drops the test for #157 entirely, because that test
embeds assumptions about the way that calibration is done that are no
longer true.
If this is merged, we should close#279 without merging it.
Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
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