Merge branch 'FixSymPy' into 'master'

lbmpy/boundaries/boundaryhandling.py

lbmpy/creationfunctions.py

lbmpy/methods/abstractlbmethod.py

lbmpy/methods/creationfunctions.py

lbmpy/methods/momentbased/momentbasedmethod.py

lbmpy/methods/momentbased/momentbasedsimplifications.py

lbmpy_tests/phasefield/test_entropic_model.ipynb

lbmpy_tests/phasefield/test_n_phase_boyer_noncoupled.ipynb

lbmpy_tests/test_fluctuating_lb.py

lbmpy_tests/test_force.py

lbmpy_tests/test_free_slip.ipynb

lbmpy_tests/test_free_slip.py

lbmpy_tests/test_momentbased_equivalences.py

lbmpy_tests/test_oldroydb.py

lbmpy_tests/test_srt_trt_simplifications.py

pytest.ini

setup.py