As we now support Orfeo Toolbox automatically, it would be really great to have similar support for SAGA-GIS.

This support would be very similar to the OTB one in the sense that we will need to run an utility pogram to generate the ZCFG files.

The main idea is to call SAGA-GIS utilities to import data in SAGA-GIS specific format, then run the SAGA-GIS application as a service and at the end run SAGA-GIS utilities to export data from SAGA-GIS to basic format.