Acknowledgements

61 During this project we got help from many people. A big `thank you' to all of them, especially to Michael Downes from the AMS for his cooperation and help, to Stefan Lindner for his help with the Atari TEX<#375#><#375#> and to Sebastian Rahtz for playing a willing guinea-pig. Finally we also want to thank Ron Whitney who did a marvelous job on all our articles so far. This time we posed some extra problems because he had to first make a new format in order to read how to make a new format.