[v0.8.1] - 2021-03-23

This is only a very minor fix-up of [v0.8.0] - 2021-03-19.

Despite adding tenpy.networks.mps.MPS.term_list_correlation_function_right(), it only contains minor fixes:

• the Simulation class didn’t function under windows; some tests were failing.

• dtype issues for tenpy.models.model.CouplingModel.add_coupling()