V0.2.4 plot fixes case comp

HISTORY.rst

examples/check_timeseries_stationarity.ipynb

examples/postprocess_cascade_case.ipynb

ntrfc/__init__.py

ntrfc/meshquality/standards.py

ntrfc/timeseries/stationarity.py

ntrfc/turbo/cascade_case/casemeta/casemeta.py

ntrfc/turbo/cascade_case/post.py

ntrfc/turbo/cascade_case/solution.py

pyproject.toml

setup.cfg

tests/turbo/cascadecase/test_post.py

tests/turbo/cascadecase/test_solution.py