Add class SMARTCARB Dataset to init Level-2 with uncertainty scenario and constellation that can be used by divergence method to laziliy request datasets for next date. Adding a similar class for other satellites makes method indepdent from SMARTCARB dataset

Unmix plumes

Rewrite cross-sectional flux method (and add support for reading TROPOMI data)

Fix coco2 dims and other bugs

Fix bugs with using along dimensions in CoCO2 dataset and another bug with nans uncertainties of fluxes for noise-free data.