Adaptations to changes in pystencils (renaming of stencil plots)

.flake8

doc/notebooks/01_tutorial_predefinedScenarios.ipynb

doc/notebooks/02_tutorial_boundary_setup.ipynb

doc/notebooks/03_tutorial_lbm_formulation.ipynb

doc/notebooks/06_tutorial_thermal_lbm.ipynb

doc/notebooks/demo_create_method_from_scratch.ipynb

...s/demo_moments_cumulants_and_maxwellian_equilibrium.ipynb

doc/notebooks/demo_stencils.ipynb

...retical_background_generic_equilibrium_construction.ipynb

lbmpy/boundaries/boundaryhandling.py

lbmpy/creationfunctions.py

lbmpy/fieldaccess.py

lbmpy/methods/creationfunctions.py

lbmpy/moments.py

lbmpy/phasefield/experiments1D.py

lbmpy/phasefield/experiments2D.py

lbmpy/plot.py

lbmpy/session.py

.../full_scenarios/schaefer_turek/scenario_schaefer_turek.py

.../full_scenarios/square_channel/scenario_square_channel.py