opus_core/allocation_model.py in wrong package?

[borning]

If you run the unit tests for opus_core/allocation_model.py without having the packages urbansim_parcel and urbansim installed you get an error, since it uses those in the unit tests. opus_core shouldn't depend on urbansim and urbansim_parcel ... can we make the unit test standalone, so that it only uses opus_core? Or move this model to the urbansim package instead, and remove the reliance on urbansim_parcel in the unit test?