revisions2 multi-timescale paper modifications of functions for plotting histogram and bowplots of residuals

revisions 2 multi-timescale paper additional modif residuals analysis

revisions2 muli-timescale paper adding residuals analysis

revisions 1 multi-timescale paper, adding function to plot average MAE per station

revisions 1, multi timescale paper adding table with summary month accuracy comparison

proof RS paper contribution of covar, increasing resolution of figures

proof paper RS contribution of covar, modification to figures

revisions RS contribution of covar, spatial correlogram and graphical abstract

gam fitting, adding option to run fitting with starting list of k values and clean up

gam fitting diagnostic, degug functions, cleaning up of code