Given an ordertable such as F1_table_2017 which is a
“wikitable” object, function as.ordertable() returns a
nicified version in which entries such as DNS are replaced with zeros.
Finishing competitors are assigned numbers \(1-n\) with no gaps; the
function can be used to extract a subset of competitors.
Function ordertable2supp() offers similar functionality but
returns a hyper2 object directly.