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

FUSION, comparison to GAM models using the same testing and training data

FUSION, using GAM for bias surface, correction aspects

FUSION, training and testing for year 2010 read from the GHCND database