[Insight-developers] new filter: Hausdorff distance

[Lydia Ng]

FYI -

There are two new filters to compute the directed and full
Hausdorff distance between the set of non-zero pixels of
two images.
These are useful for computing segmentation masks.

See docs for DirectedHausdorffDistanceImageFilter=20
and HausdorffDistanceImageFilter for details.

- Lydia