- New functions: jungfrau_cal_mdata and force_fixed_gain_constants
- Try retrieving fixed gain constants, try retrieving dynamic gain constants if no fixed constants
- Dont accept dynamic gain constants older than 3 days

- Move jungfraulib and jfstrixel into new director src/cal_tools/jungfrau
- add new npz files into jungfrau directory for strixel conversion.
- clean up jfstrixel to be able to use jungfrau npz files.
- Update strixel_sensor from boolean to string
- Update JF correction notebook to specify the kind of strixel A1256 or A0123