automatically add new DC data

[graybeal]

Is your feature request related to a problem? If so please describe.
If new Statistical Variables become available, we can't be changing the code constantly to include them.

Describe the solution you'd like
A clear and concise description of what you want to happen.
An offline process needs to scour the graph for new Statistical Variables and add them to the appropriate UIs.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

• Or, we could use a foolproof notification process for new Statistical Variables. But this seems fraught.

Additional context
Add any other context or screenshots about the feature request here.
If the new Statistical Variable has a new location type, then we have a different level of problem.