added scenarios 1 and 2

replaced seq of gc day with sequence over range of modelled vales
added respiuration scenario #3 and

had to add variable of resp outside model

added column to dataframe for scenario #3 cday

saved the new model runs
made new script for plotting objects for cday model to be sourced
rearranged script to first load sims with mean values and scenarios

moved plotting objects

sims with treatments are at bottom
new root respiration model sim and new treatment allocation sim with revised gCday seq
added root respiration sim