Dr_SFC GĐ1 simple report

BC member-selection diagnostics
BC Stack/Ensemble verification maps
Drought event verification
NetCDF for GĐ2: outputs/Clim/Obs_Monthly_Clim.nc, outputs/Clim/Mod_Monthly_Clim.nc, model artifacts in artifacts/final_models_for_GD2, SPEI params in artifacts/spei_params.