the sankey plot is generated using networkD3 and exported by making a screenshot with webshot. This turns out to be difficult to get past extensive R-CMD checks and therefore hinders a CRAN submission.

We want to:

• recode the sankey plot in ggplot2 and ggalluvial
• drop the webshot and networkD3 dependencies
• remove any interactive components in the sankey plot, keep only a static version

• related webshot.js failure from devtools::check_win_devel() #363
• related consider warning if webshot::is_phantomjs_installed() == FALSE instead of error #356
• related replace webshot dependency with webshot2? pacta.multi.loanbook.plot#36