Object rowing is created by the code in inst/rowing.Rmd.
This reads file inst/rowing.txt, each line of which is a heat
showing the finishing order. Object rowing_table is the
corresponding R list.
File inst/rowing_minimal.txt has the same data but with dominated
players (that is, any group of players none of whom have beaten any
player not in the group) have been removed. This is because dominated
players have a ML strength of zero.