Merge branch 'master' of https://i10git.cs.fau.de/pycodegen/pystencils into VoF

doc/notebooks/demo_benchmark.ipynb

doc/version_from_git.py

pystencils/astnodes.py

pystencils/boundaries/boundaryhandling.py

pystencils/cpu/kernelcreation.py

pystencils/datahandling/datahandling_interface.py

pystencils/datahandling/serial_datahandling.py

pystencils/fd/finitevolumes.py

pystencils/gpucuda/kernelcreation.py

pystencils/gpucuda/texture_utils.py

release.sh