Merge branch 'cupy' into 'master'

.gitignore

README.md

binder/environment.yml

conftest.py

doc/notebooks/01_tutorial_getting_started.ipynb

doc/notebooks/03_tutorial_datahandling.ipynb

doc/notebooks/06_tutorial_phasefield_dentritic_growth.ipynb

doc/notebooks/demo_wave_equation.ipynb

doc/sphinx/kernel_compile_and_call.rst

pystencils/__init__.py

pystencils/boundaries/boundaryhandling.py

pystencils/config.py

pystencils/datahandling/blockiteration.py

pystencils/datahandling/datahandling_interface.py

pystencils/datahandling/parallel_datahandling.py

pystencils/datahandling/pycuda.py

pystencils/datahandling/serial_datahandling.py

pystencils/gpu/__init__.py

pystencils/gpu/cudajit.py

pystencils/gpu/gpu_array_handler.py