Martin Maechler, based on S original by Peter Rousseeuw <rousse@uia.ua.ac.be>,
	Anja.Struyf@uia.ua.ac.be and Mia.Hubert@uia.ua.ac.be,
	and initial R port by Kurt.Hornik@R-project.org
Cluster Analysis Extended Rousseeuw et al.
Cluster Analysis, extended original from
  Peter Rousseeuw, Anja Struyf and Mia Hubert.
two small examples using MASS' cov.rob() and mvrnorm()