removed unused gamplotandpred, plotg
Major clean up of smoothplotbypft (now smoothplot): more generic, few more options and arguments
figures.R uses new smoothplot
Major update mixmean, incorporates significance letters, and meansbypft (slightly more generic and clean). Major update FigS8 (all pft-biome combos included when data present; caption update).
smoothplot can 'account' for random effects by aggregating
more climate effects analyses; with averaged random effects