Change tests from Guo to Luo if they don’t use SRT

doc/notebooks/05_tutorial_modifying_method_smagorinsky.ipynb

doc/sphinx/lbmpy.bib

lbmpy/forcemodels.py

lbmpy_tests/test_entropic.py

lbmpy_tests/test_fluctuation.py

lbmpy_tests/test_force.py

lbmpy_tests/test_split_optimization.py

lbmpy_tests/test_srt_trt_simplifications.py