Helper function - plots Pareto optimality Ri across the grid.
Contours are color coded according Ri score. Additionally,
the Pareto front is drawn using geom_smooth on the subset of
points whose Ri == maximum Ri
Usage
plot_ggPareto(x, n1 =NULL, n2 =NULL)
Arguments
x
PO_List object, result of calc_lscp_Pareto. Alternatively, a dataframe or tibble containing trait values