standardize

OccEvent.standardize(

self: OccEvent,

) → OccEvent

Put event into standardized form with regard to permutation/reversal.

This is equivalent to:

forward_occ_event = self.copy().sort();
reverse_occ_event = self.copy().reverse().sort();
if (reverse_occ_event < occ_event) {
  self = reverse_occ_event;
}
else {
  self = forward_occ_event;
}