Metadata and test data for new ERT tables at TEMPEST

[bpbond]

Closes #474

[bpbond]

Right now the ERT data outputs in this PR look like this:

• Instrument_ID = "ERT"
• "A" or "B" sensors are identified via Sensor_ID

However the existing redox data have outputs that look like this:

• Instrument_ID is used to identify "A" or "B"

Which form do we prefer?

@stephpenn1 @roylrich (anyone else to tag in on this?)

[stephpenn1]

My vote is for option A (Instrument_ID = "ERT"; "A" or "B" sensors are identified via Sensor_ID).

I'm seeing that the existing design table example looks like the below, I'm confused how the existing redox ends up as your second photo?

Logger	Table	loggernet_variable	Site	Plot	Instrument	Instrument_ID	Sensor_ID	Location	valid_through	research_name	note
COMPASS_GCW_TR_432	Redox5	RedoxRa({1:12})	GCW	TR	Redox		{1:12}a			redox-5cm
COMPASS_GCW_TR_432	Redox5	RedoxRb({1:12})	GCW	TR	Redox		{1:12}b			redox-5cm

[bpbond]

Thanks @stephpenn1

I'm confused how the existing redox ends up as your second photo

It varies between sites -- some use the Instrument_ID, but others don't.