message: add GraphCutSeamFinder
diff: @@ -49,6 +49,8 @@ except AttributeError:
  print("AKAZE not available")
  SEAM_FIND_CHOICES = OrderedDict()
  +SEAM_FIND_CHOICES['gc_color'] = cv.detail_GraphCutSeamFinder('COST_COLOR')
  +SEAM_FIND_CHOICES['gc_colorgrad'] = cv.detail_GraphCutSeamFinder('COST_COLOR_GRAD')
  SEAM_FIND_CHOICES['dp_color'] = cv.detail_DpSeamFinder('COLOR')
  SEAM_FIND_CHOICES['dp_colorgrad'] = cv.detail_DpSeamFinder('COLOR_GRAD')
  SEAM_FIND_CHOICES['voronoi'] = cv.detail.SeamFinder_createDefault(cv.detail.SeamFinder_VORONOI_SEAM)
  