clean up of mosaicing main script and more testing for kriging of residuals at stations

adding functions for residuals kriging options and clean up function mosaicing script

producing residuals kriged surface for testing using training data

adding residuals calls to function for kriging of residuals and clean up of main mosaicing script

testing code on NEX for accuracy metrics kriging of resiudals and gdalmerge modified script

mosaicing script adding functions relevant to accuracy and residuals surface kriging

more modifications for mosaicing of functions for residuals, test for several days

testing accuracy function in the main script with data_s and data_v, training and testing

testing autokrige function for residuals of stations

modifying function script to add kriging function for residuals of predictions at stations