This merge request is to include functions for the ADAMONT methodology to
- adjust ensemble predictions to observation data based on weather regimes
- find analogs in observation data based on weather regimes
The final step of the methodology for time disaggregation was not included (function isn't mature enough) but these two functions CST_AdamontQQCorr.R and CST_AdamontAnalog.R can be used in another context. Also included in a seperate file, is a function invisible to users to compute a Nearest Neighbor on irregular 2D lat/lon grids (e.g. UERRA dataset); this is needed only for specific cases coded in the CST_AdamontQQCorr.R function.