ensemble-networkx_2023.7.18

Fixed issue with SampleSpecificPerturbationNetwork not being able to handle X.index with a .name that was not NoneType. Created a hack to allow pd.MultiIndex support (converts to strings and warns). Made include_reference_for_samplespecific=True the new default which creates a clone of the reference and uses that as the background network. Added is_square to Symmetric object.