S original <http://statwww.epfl.ch/davison/BMA/library.html> by
Angelo Canty <cantya@mcmaster.ca>. R port by Brian Ripley
<ripley@stats.ox.ac.uk>.
functions and datasets for bootstrapping from the book
"Bootstrap Methods and Their Applications" by A. C. Davison and
D. V. Hinkley (1997, CUP).