Merge branch 'Skip_interpolation_tests' into 'master'

.flake8

.gitlab-ci.yml

conftest.py

pystencils/assignment.py

pystencils/astnodes.py

pystencils/backends/cbackend.py

pystencils/backends/cuda_backend.py

pystencils/backends/dot.py

pystencils/backends/opencl_backend.py

pystencils/backends/simd_instruction_sets.py

pystencils/boundaries/boundaryhandling.py

pystencils/cpu/cpujit.py

pystencils/cpu/kernelcreation.py

pystencils/cpu/msvc_detection.py

pystencils/cpu/vectorization.py

pystencils/data_types.py

pystencils/datahandling/parallel_datahandling.py

pystencils/datahandling/serial_datahandling.py

pystencils/display_utils.py

pystencils/fd/derivation.py