modifications for monthly hold out in raster prediction script

first modifications for hold out at monthly timescale, master script and monthly sampling function

contribution covariates fig and tables for manuscript

contribution of covariates fig and tables for paper, functions used in script

initial commit contribution of covariates functions for paper

contribution of covariates paper, script major clean up and modification -splitting functions and script

contribution of covariates paper script major modification analyses and figures

running gam daily comb3 OR with revised screening for paper analyses

running gam daily comb3 OR with revised screening for paper analyses

running kriging fusion comb3 OR with revised screening for paper analyses