- Change how receiver templates and affixes are used
- Refactor and correct data sources list from receivers to data_sources
- Apply related refactors based on last item.

- Different way in using receiver templates and affixes
- Correct naming data source parameter name from receivers to data_sources
- apply refactors based on this

- 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