Fixed second stage pipeline

doc/notebooks/01_tutorial_getting_started.ipynb

doc/sphinx/kernel_compile_and_call.rst

pystencils/backends/cbackend.py

pystencils/backends/dot.py

pystencils/config.py

pystencils/display_utils.py

pystencils/typing/leaf_typing.py

pystencils_tests/test_math_functions.py

pystencils_tests/test_simplifications.py

pystencils_tests/test_vectorization.py

pystencils_tests/test_vectorization_specific.py