Kriging, modification to save kriged surfaces in geotiff and png files, task #364

Kriging, modifying code to save training and testing samples in shapefiles: task #364

Kriging for OR, this is the first script, task #364

GWR modified code to save plots and images, task #364

GWR assessment by visualizing residuals using kriging

GWR in adding loop for 10 dates

GWR first script for one date in OR, task #364

Added 3 new models and nesting to GAM, task #361

Changes in the diagnostics plots, barplots.

Transform aspect in Eastness and Northness variables in the GAM.