fixed a bug in edge generation (problem was in renaming vpPaths); added split arg to control whether node names are automatically split;  added draw arg to control whether the graph is drawn

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/griddebug@17 edb9625f-4e0d-4859-8d74-9fd3b1da38cb