Another Plot PACKage: stem.leaf, bagplot, faces, spin3R,
plotsummary, plothulls, and some slider functions
set of functions for drawing some special plots:
   stem.leaf plots a stem and leaf plot,
   stem.leaf.backback plots back-to-back versions of stem and leafs,
   bagplot plots a bagplot,
   skyline.hist plots several histgramm in one plot of a one dimensional data set,
   plotsummary plots a graphical summary of a data set with one or more variables,
   plothulls plots sequentially hulls of a bivariate data set,
   faces plots chernoff faces,
   spin3R for an inspection of a 3-dim point cloud,
   slider functions for interactive graphics.