Updated parameterization for hybrid inversion :
includes distribution and co-distribution described in Sentienl-2 ATBD (http://step.esa.int/docs/extra/ATBD_S2ToolBox_V2.1.pdf)
includes noise described in Sentinel-2 ATBD
possibility to provide user-defined input PROSAIL parameters, and user defined BRF LUT
Hybrid inversion based on 4SAIL2 only applicable when user defines BRF LUT and input PROSAIL.