Sdss-yao

✨ Improved

* Check if shutter times out while opening/closing. If the shutter fails closing, the exposure is read anyway.
* Check if specMech is responding on each `mech`` actor command.

✨ Improved

* Use `BOSS_extra_purge_erase_v8.acf` which mimics the voltages used at APO for b2 (e2v). This seems to solve the "puddles" seen around the serial register and may improve the settle time after a power cycle.

🚀 New

* [2](https://github.com/sdss/yao/pull/2) Add alerts for LN2 and CCD temperature and actor heartbeat.

✨ Improved

* Use new ACF file with e-purge, erase, and improvements to horizontal transfer.
* Change flushing to not binned.
* Upgraded to use `sdss-archon>=0.9.0`.
* The collecting of actor information (lamps, specMech, etc.) now happens during the exposure instead of after readout completes.
* Create checksum files using `sha1sum`.

🏷️ Change

* Set b2 temperature to -98 degC.

🚀 New

* First stable version tested at LCO.
* Added `MechController.pneumatic_status()` method.

✨ Improved

* `mech move --home` has been renamed to `--center`.
* Moving all three collimator motors at once to an absolute position is no longer allowed.
* Additional safety checks before sending any move command to the collimator motors.
* `SpecMechReply.sentence` has been removed since different replies for the same command can have difference sentences. The sentence is stored as the first value in the reply on each `SpecMechReply.data` (the `S[0-9]` prefix is removed).
* Added multiple new header keywords (LCO TCC, specMech, etc.)

🏷️ Changed

* Rename `fan_volts` -> `power_supply_volts`.

🔧 Fixed

* Fixed several bugs and confirmed that `yao hartmann` works as expected.

🚀 New

* Initial version of `yao`.
* [1](https://github.com/sdss/yao/pull/1) Initial implementation of the specMech controller based on [specActor](https://github.com/aidancgray/specActor).