lisa.analysis: Align plotting functions
All plotting functions now take both filepath and axis/axes parameters with the same semantic everywhere. In a few of them, the parameter "pct" has been moved before filepath for consistency.
This was only tested so far with the self-tests, so it would need some more coverage. EDIT: also tested with:
- ipynb/examples/typical_experiment.ipynb
- ipynb/tests/synthetics_example.ipynb