Merge master

pystencils/astnodes.py

pystencils/backends/simd_instruction_sets.py

pystencils/backends/x86_instruction_sets.py

pystencils/cpu/vectorization.py

pystencils/gpu/indexing.py

pystencils/gpu/kernelcreation.py

pystencils/include/aesni_rand.h

pystencils/include/myintrin.h

pystencils/include/philox_rand.h

pystencils/simp/simplifications.py

pystencils/transformations.py

pystencils_tests/test_gpu.py

pystencils_tests/test_move_constant_before_loop.py

pystencils_tests/test_random.py

pystencils_tests/test_simplifications.py

pystencils_tests/test_vectorization.py

pystencils_tests/test_vectorization_specific.py