working on delim model; still need to fix the updating step so that collapses are allowed to happen after merges; also have to deal with lumping multiple species but separately (A+B) and (C+D)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phrapl@146 edb9625f-4e0d-4859-8d74-9fd3b1da38cb