Indexed domain kernel

pystencils/astnodes.py

pystencils/backends/cbackend.py

pystencils/cpu/kernelcreation.py

pystencils/field.py

pystencils/gpu/indexing.py

pystencils/gpu/kernelcreation.py

pystencils/node_collection.py

pystencils/transformations.py

pystencils/typing/types.py

pystencils_tests/test_indexed_kernels.py