message: Prefer addall instead of iteration for performance
diff: @@ -519,8 +519,7 @@ public class Converters {
  Mat res;
  int lCount = (pts != null) ? pts.size() : 0;
  if (lCount > 0) {
  - for (MatOfPoint vpt : pts)
  - mats.add(vpt);
  + mats.addAll(pts);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  @@ -568,8 +567,7 @@ public class Converters {
  Mat res;
  int lCount = (pts != null) ? pts.size() : 0;
  if (lCount > 0) {
  - for (MatOfPoint2f vpt : pts)
  - mats.add(vpt);
  + mats.addAll(pts);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  @@ -600,8 +598,7 @@ public class Converters {
  Mat res;
  int lCount = (pts != null) ? pts.size() : 0;
  if (lCount > 0) {
  - for (MatOfPoint3f vpt : pts)
  - mats.add(vpt);
  + mats.addAll(pts);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  @@ -614,8 +611,7 @@ public class Converters {
  Mat res;
  int lCount = (kps != null) ? kps.size() : 0;
  if (lCount > 0) {
  - for (MatOfKeyPoint vkp : kps)
  - mats.add(vkp);
  + mats.addAll(kps);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  @@ -714,8 +710,7 @@ public class Converters {
  Mat res;
  int lCount = (lvdm != null) ? lvdm.size() : 0;
  if (lCount > 0) {
  - for (MatOfDMatch vdm : lvdm)
  - mats.add(vdm);
  + mats.addAll(lvdm);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  @@ -746,8 +741,7 @@ public class Converters {
  Mat res;
  int lCount = (lvb != null) ? lvb.size() : 0;
  if (lCount > 0) {
  - for (MatOfByte vb : lvb)
  - mats.add(vb);
  + mats.addAll(lvb);
  res = vector_Mat_to_Mat(mats);
  } else {
  res = new Mat();
  