message: Tidy up mix_by_decile logic
diff: @@ -619,10 +619,10 @@ def mix_by_decile(games, moves, deciles=9):
  # fr_: fraction
  # _r: resign (ordinary)
  # _nr: no-resign
  - lesser = 10 - math.floor(deciles)
  - greater = 10 - lesser
  + ct_total = 10
  + lesser = ct_total - math.floor(deciles)
  + greater = ct_total - lesser
  ct_r, ct_nr = greater, lesser
  - ct_total = ct_r + ct_nr
  fr_r = ct_r / ct_total
  fr_nr = ct_nr / ct_total
  games_r = math.ceil(games * fr_r)
  