These documents explain how to profile arti for CPU and memory, and
how to simulate different kinds of breakage and misconfiguration.

They aren't at all in their final form, but I figure it's useful to
check them in so that more people can look at them, and make
suggestions.

Simpify tor-netdoc TokVal

See merge request tpo/core/arti!404

Replace humantime_serde_option with upstream code

Closes #396

See merge request tpo/core/arti!406

We have upstreamed this code.

This reverts commit 6193c9d9.

Replace all uses of our copy of this code.

This has the humantime_serde::option module, which we have upstreamed
and are about to switch to.

The remaining dependency with  version = "1"  is going to be removed
in a moment.

arti: Move all code from binary crate to library crate

See merge request tpo/core/arti!403

tor-netdoc: Save allocation space in GenericRouterstatus

Closes #387

See merge request tpo/core/arti!400

(Once we're done parsing these, the vector will never get any
longer.)

This should save around 181K of heap on a current directory.

When the version is a Tor version, we can just parse it; otherwise,
we can intern it.  This shrinks GenericRouterStatus and avoids a lot
of extra help allocations.

This is the default vscode format, and seems popular elsewhere.
This commit does nothing but reformat.

Part of #387

This enum was otiose: its set of valid values is precisely those of a
Vec.  (Indeed what would TokVal::Multi(vec![]) have meant?)

I ought to have c&p these.

As per
  tpo/core/arti!403 (comment 2786099)

This does not constitute any kind of stable API promise.
But it might allow people to use our arti client code in novel ways.

This is just code motion and the minimal fixups.

std::slice::from_ref exists.  Spotted while reviewing !400

Make ArtiConfigBuilder contain a TorClientConfigBuilder

See merge request tpo/core/arti!401

Follow-up from arti!318

See merge request tpo/core/arti!402

Make update_config only conditionally exported; add semver-status update.

Add flatfile DirMgr

See merge request tpo/core/arti!318

This is an API break: now one must use `.tor()` to access the Tor
configuration parts.

But it is not a config file format break, because `#[serde(flatten)]`.

As per #371

tests/chutney: Merge chutney-launching scripts

See merge request tpo/core/arti!396

It turns out that the clone-and-hack in tests/chutney/arti-bench
was not identical to the original in tests/chutney/setup.

I diffed the two and preferred the version from arti-bench.

Formerly, the "launch a chutney network" code was duplicated in
"setup" and "arti-bench", since "setup" always launched an arti
proxy, while "arti-bench" didn't want that functionality.

Now the "setup" script launches an arti proxy conditionally,
depending on whether the "proxy" argument is given.

Drop config back-conversion from FooConfig to FooConfigBuilder

See merge request tpo/core/arti!391

arti-testing: support for simulated TCP breakage

See merge request tpo/core/arti!392