-Added calculate_icers_psa function -Added argument to plot.owsa and plot.twsa for the plotting of specific points (e.g. base case values) on top of default plot
-Patch fix for compatibility with ggplot2 3.3.1. scale_fill_discrete and scale_color_discrete now differentiated in add_common_aes.R. Previous version of add_common_aes caused error with ggplot2 3.3.1
-Initial CRAN submission