* Revert benchmarks back to libtest
Criterion has too many dependencies, it's execution as slower, and
we didn't see the kind of precision we had hoped for to use it to
block CI builds.
* Ignore benchmarks that take more than a few milliseconds per iteration
* Revert "Ignore benchmarks that take more than a few milliseconds per iteration"
This reverts commit b87cdf6ef4.
* Don't run benchmarks in CI
They are already built in the nightly build. Executing them in CI
doesn't add much value until the results are precise enough to act
on.
We'll avoid introducing three-letter terms to free up the namespace
for three-letter acronyms.
But recognize the term "sigverify", a verb, to verify a digital
signature.
Clippy told us to change function parameters to references, but
wasn't able to then tell us that the clone() before borrowing
was superfluous. This patch removes those by hand.
No expectation of a performance improvement here, since we were
just cloning reference counts. Just removes a bunch of noise.
