Pioreactor

- The `logs` table in the database now contains, by default, all the DEBUG and up logs
from all Pioreactors. It also has a new column to denote the software source of the log. A separate topic is now set up for the logging in the UI.
- `pioreactor.local` is now the default URL of the PioreactorUI.
- on Pioreactor install, a seed experiment is created so users aren't dropped into a "blank" UI.
- `pubsub.subscribe_and_callback` can now filter retained messages.
- "algorithms" is now called "automations" throughout
- reduced the number of threads per job
- new topic for raw ADC measurements: `pioreactor/<unit>/<experiment>/adc/<channel>`
- improved MQTT QOS for important jobs

- `pios sync` is now `pios upgrade`.
- `pio upgrade` requires flags: `--app` and / or `--ui` to upgrade the PioreactorApp and PioreactorUI respectively.

- new SQL tables: `led_events`, `led_algorithm_settings`
- `dosing_algorithm_settings` has a new schema: a json blob to represent any editable settings.
- new `pio` command: `pio run led_intensity`, ex: `pio run led_intensity --channel B intensity 50`
- new `pio` command: `pio update` will update the software to the latest code on Github (later will be latest released version), and if possible, update the UI code as well.
- new library dependency `DAC43608` that supports our LED driver.
- config.ini now has abstracted any RaspberryPi pins: we only refer to the PCB labels now in config.ini
- `pio kill` can accept multiple jobs, ex: `pio kill stirring od_reading`