Andrew Kay

Results 2 issues of Andrew Kay

This PR will address https://github.com/ActivitySim/activitysim/issues/784 -- and supersedes a [Draft PR in the Camsys fork.](https://github.com/camsys/activitysim/pull/1). As scoped, validating expressions is not included, and the code isn't worried about tables at...

While developing the [Settings Checker](https://github.com/ActivitySim/activitysim/pull/950), it became clear that spurious model configurations (which are happily ignored by some of the actual processing steps) are allowed in the model settings YAML...