git-svn-id: https://tuftsvue.svn.sourceforge.net/svnroot/tuftsvue/branches/helenoliver@11405 d66e5487-c4fa-4dda-8c8e-ca23240363c0
git-svn-id: https://tuftsvue.svn.sourceforge.net/svnroot/tuftsvue/branches/helenoliver@11406 d66e5487-c4fa-4dda-8c8e-ca23240363c0
added Marco Romano code to compute argumentation on IBIS node

git-svn-id: https://tuftsvue.svn.sourceforge.net/svnroot/tuftsvue/branches/helenoliver@11407 d66e5487-c4fa-4dda-8c8e-ca23240363c0