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

gam fitting diagnostic, adding rmse, mae and other metrics as well as wrap function to run fit at different

gam fitting diagnostic for low station count, adding function to collect k-index diagnostics

initial commit, script for gam fitting experimentation - fitting in low stations area