use correct history limiting option

Dependencies

• [2] PQKTNYVZ header + reindentation
• [3] MAGPFPZB init

Change contents

• replacement in vc-darcs.el at line 469
  [2.3949]→[2.3949:4013](∅→∅)
  − (and limit (list "--last" (format "%d" limit)))))))
  [2.3949]

  [3.16973]
  + (and limit (list "--max-count" (format "%d" limit)))))))