Dan Jordan 0be5f72e35 Robustify YAML config file validation, enhance unit tests
* Fixed run path/too/deep duplication logic
* Add more unit testing to cover edge cases in the YAML file
* Unify type checking to reduce code duplication
* Empty sections like run: are still ignored but now produce an error
  to remind the user to clean them up.
* Make get_sims() work with labels=None
* Test SIMs within deep directory structures to exercise pathing logic
* Add test for invalid sim path: syntax

Refs #1159
2021-06-25 16:02:12 -05:00
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