KRIGING, modified function for memory clean up and other improvements

KRIGING, raster prediction full year, function used in main script

KRIGING, raster prediction for full year using function TASK#364

KRIGING, raster prediction-major changes for spatially explicit interp.

OR, Kriging using automated fitting of variograms TASK#364

FUSION function to predict raster, clean up of mod object using as.formula

FUSION, GAM and fusion comparison raster prediction modified return object to solve memory issues in mod object

FUSION, raster prediction using function in mcapply

FUSION, using parallel for raster prediction with function

FUSION, adding option to use same proportion of training for fusion and gam