1- Update key names h5path, h5path_ctrl, receiver_id, ...
2- Start using extra-data to read files.
3- Introduce AGIPDCtrl to read slow data.

- trailing whitespace
- unused variables
- unused imports
- misc formatting

nbstripout, some flake8 (removing unused variables, imports), isort, simplifying retrieve_constants
as it does not need to work under ipyparallel

Fix/pre commit isort

See merge request detectors/pycalibration!434