Adding folder for AndiStephens

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@247 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Adding Andi's compositional expansion code.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@248 edb9625f-4e0d-4859-8d74-9fd3b1da38cb