Triangulation of irregularly spaced data
Fortran code by R. J. Renka.
        R functions by Albrecht Gebhardt <albrecht.gebhardt@uni-klu.ac.at>.
        With contributions from Stephen Eglen <stephen@anc.ed.ac.uk>,
        Sergei Zuyev <sergei@stams.strath.ac.uk> and
	Denis White <white.denis@epamail.epa.gov>
A constrained two-dimensional Delaunay triangulation package