Translate min_rank, dense_rank, percent_rank, & cume_dist

[markfairbanks]

No description provided.

[eutwt]

Looks good. Would be nice to have a single-argument assertion for these too, like with desc()

dtplyr/R/tidyeval.R

Lines 154 to 157 in dae58ec

	} else if (is_call(x, "desc")) {
	if (!has_length(x, 2L)) {
	abort("`desc()` expects exactly one argument.")
	}