* 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.
Document property maps and move them to Support Lib:
* Added new chapter "CGAL abd Boost Property Maps" (Property_map) to Support Lib:
- it is located in Point_set_processing_3/doc_tex/Property_map.
- it documents Dereference_property_map, First_of_pair_property_map, Second_of_pair_property_map and Nth_of_tuple_property_map.
* Renamed point_set_property_map.h as property_map.h
* Moved Normal_vector_property_map to Point_with_normal_3.h and renamed it Normal_of_point_with_normal_pmap.