Allow ranking of columns

[ONSSamBennett]

Current solution in pug:

• var key_occs = ["doctors", "nurses"]

• var order = "descending"

• var ranked_key_occs = !place ? null: key_occs.sort((a, b) => order === "descending" ? lookup[place.parentcd][b] - lookup[place.parentcd][a] : lookup[place.parentcd][a] - lookup[place.parentcd][b]);

  section.Section
  p The highest key occupation for #{lookup[place.parentcd]["areanm"]} was #{ranked_key_occs[0]} on #{lookup[place.parentcd][ranked_key_occs[0]]}