Merge remote-tracking branch 'upstream/master' into tutorial_fixes_new

.gitignore

.gitlab-ci.yml

conftest.py

doc/conf.py

doc/notebooks/00_tutorial_lbmpy_walberla_overview.ipynb

doc/notebooks/03_tutorial_lbm_formulation.ipynb

doc/notebooks/04_tutorial_cumulant_LBM.ipynb

doc/notebooks/07_tutorial_thermal_lbm.ipynb

doc/notebooks/08_tutorial_shanchen_twophase.ipynb

doc/notebooks/09_tutorial_shanchen_twocomponent.ipynb

...books/10_tutorial_conservative_allen_cahn_two_phase.ipynb

doc/sphinx/enums.rst

doc/sphinx/lbmpy.bib

doc/sphinx/methods.rst

doc/sphinx/zbibliography.rst

lbmpy/__init__.py

lbmpy/advanced_streaming/communication.py

lbmpy/advanced_streaming/indexing.py

lbmpy/advanced_streaming/utility.py

lbmpy/boundaries/boundaryconditions.py