Issue494 baselinetesting 2

[dhblum]

This is for #494 and followup up on https://github.com/ibpsa/project1-boptest/pull/495 to finalize merging.

To-Dos:

• [ ] Verify added if-else in interface.py (see here)
• [ ] Pass unit tests
• [ ] Add /baselines directory description to structure in README.md