To download the gnu zipped, tarred package, select download and binary on your web browser (save next link as in netscape), and click on the following link.
To install and use, simply uncompress (gunzip) and untar that file in your preferred directory. Executables are provided in the bin subdirectory for irix (version 5.3 onwards), and dec alphas running vms. Source is provided in case you have another system, in which case, issuing a "make" command in the "src2" sub-directory should do the job for you. I am very keen to receive feedback and suggestions for the development of this program, as well as notification if it has been of use to you.martin@biop.ox.ac.uk