QCSchema lags behind what's actually implemented AND DOCUMENTED in QCElemental. The QCSchema docs are where people look for info, so this creates a misleading impression about what QCSchema is/does in practice.

Some possible solutions:

1. QCSchema/docs is always what you get from running .schema()/autodoc on the myriad models in QCElemental
2. QCElemental models represent schema in development, and from time to time we concretize its state into release versions of QCSchema.
3. QCElemental models are not allowed to change until QCSchema changes.

My favorite option is 1. I'm okay with 2. I think 3 is a bad idea.

@dgasmith @bennybp