Merge branch 'fhennig/sqrt' into 'v2.0-dev'

src/pystencils/backend/functions.py

src/pystencils/backend/kernelcreation/freeze.py

src/pystencils/backend/platforms/cuda.py

src/pystencils/backend/platforms/generic_cpu.py

src/pystencils/backend/platforms/sycl.py

src/pystencils/backend/platforms/x86.py

tests/kernelcreation/test_functions.py

tests/kernelcreation/test_staggered_kernel.py

tests/nbackend/kernelcreation/test_freeze.py

tests/runtime/test_boundary.py

tests/runtime/test_data/.gitignore

...runtime/test_data/datahandling_parallel_save_test/dst.dat

...runtime/test_data/datahandling_parallel_save_test/src.dat

tests/runtime/test_data/datahandling_save_test.npz

tests/runtime/test_datahandling.py