:= When Point type is a pair or a tuple compute_average_spacing, jet_estimate_normal, jet_smooth_point_set,
pca_estimate_normals, pca_smooth_point_set, remove_outliers and remove_outliers_wrt_median_knn_sq_distance
files couldn't compile. Now they can!
Written a detailed example (average_spacing_example.cpp) that uses the tuples type.
==> Pairs and tuples are now used in the examples.