* Fixed bug in Point_set_processing_3 examples/tests: use reasonable default knn parameters (0.1 or 0.15% of point set was overkill.* Updated the Point Set demo to use the recommended knn values by default.
* Fixed bug in Point_set_processing_3 examples/tests: use reasonable default knn parameters (0.1 or 0.15% of point set was overkill.* Updated the Point Set demo to use the recommended knn values by default.