Rpcq

* Add `YokogawaGS200Channel` message

Changelog
Additions and Improvements

- Added `SetScale` instruction (kilimanjaro).

Bugfixes

- Misc typo and annotation corrections (appleby).

Changelog

Additions and Improvements

This release includes a change to RPCQ clients to pass along the
client timeout when making an RPCQ request and a corresponding change
to the server to prefer the client timeout if it is shorter than the
server timeout (notmgsk, 126).

Changelog

Behind-the-scenes

* Fix undefined variable warnings (appleby, 103, 107).
* Improve error messages (kilimanjaro, 120).
* Restrict `msgpack` dependency (appleby, 119).
* Various quilt additions (kilimanjaro).

Features

* Add ZMQ Curve auth support (appleby, 121).