Threedigrid

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- Nothing changed yet.

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- Add `group_by_grid_id` to structure control interface.

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- Set substance units on Nodes.

- Set exchange level on levl attribute on breach geojson export.

- Removed old gridadmin file from tests.

- Set pumps on start node and add line geometry in geojson export.

- Return YZ tabulated data in geojson export if YZ profile.

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- Add cross section type and tabulated data to geojson export for:
channels, pipes, weirs, culverts, and orifices

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- Removed sphinx_rtd_theme from code dependencies. (221)

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- Substance count regex fix

- Set substance name on Nodes