Transforming validation function to allow explicit passing of arguments with calling from raster prediction function

Data preparation debugging fix calculation over 1980-2010 tmax mean, Venezuela case study

GAM fusion raster prediction, script now a function with arguments parsing and call from master function

Temperature prediction, master script now calling raster prediction as a function with explicit arguments

GAM fusion raster prediction, transforming script in function with explicit passing and tracking of arguments

GAM fusion, modidified daily and monthly functions to pass explicitly multiple arguments

GAM fusion, modification of runGAMFusion function call to allow mulitple parameters explicitly

Raster prediction, now calling sampling function and cleaning out input parameters

Sampling function to select training and testing stations, extracted and modified from earlier scripts

Temperature predictions: initial commit master script calling other functions