16 Acknowledgements
Many thanks for useful discussions and input to Robert Curtis, Ken
Yap, Paul Gomme, Michael Sanders, Michael Patra, Bryan Anderson,
Wolfram Gloger, Ray Mines, John Murdie, David Johnson, Jonathan
Barron, Michael Hirsch, Jon Nimmo, Alan Flavell, Ron Kumon, Magne
Rudshaug, Rick Mabry, Andrew Trevorrow, Guy Albertelli II, Steve
Schaefer and for bug
reports from others too numerous to mention.