Merge branch 'fhennig/migrate-tests' into 'v2.0-dev'

.gitlab-ci.yml

conftest.py

docs/source/tutorials/01_tutorial_getting_started.ipynb

docs/source/tutorials/02_tutorial_basic_kernels.ipynb

docs/source/tutorials/demo_plotting_and_animation.ipynb

pytest.ini

src/pystencils/boundaries/boundaryhandling.py

src/pystencils/datahandling/parallel_datahandling.py

tests/_old/test_base_pointer_specification.py

tests/_old/test_config.py

tests/_old/test_create_kernel_config.py

tests/_old/test_global_definitions.py

tests/_old/test_jacobi_cbackend.py

tests/_old/test_json_backend.py

tests/_old/test_json_serializer.py

tests/_old/test_move_constant_before_loop.py

tests/_old/test_printing.py

tests/_old/test_source_code_comment.py

tests/_old/test_transformations.py

tests/_old/test_type_interference.py