Include capabilities for adding ADF comparisons with observations

[TeaganKing]

We currently are implementing ADF model-model comparisons. Per @justin-richling 's suggestion, we should also compare model-obs. This will require updates to generate_adf_config_file.py to include observational-related parameters, updates to cupid config files to include observational parameters, as well as an additional observational comparison default configuration file from ADF.

We could alternatively not include observational comparisons, but it would be best to have these available to users.

See #141 and #142 for current implementation of generating ADF config files and looking at ADF output via CUPiD.