Prefix plot filenames with figure number in knitr/ #QuartoPub
```
knitr::opts_hooks$set(label = function(options) {
this_label <- knitr::opts_current$get("label")
if (!startsWith(this_label, "fig")) {
return(options)
}
all_chunks <- knitr::all_labels(startsWith(label, "fig"))
fig_num <- […]
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Elio Campitelli
