make changes according to reviewer 2. --This line, and those below, will 
be ignored--

M    frontiers/frontiers_comments.txt
M    frontiers/frontiers.Rnw


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/semtools@301 edb9625f-4e0d-4859-8d74-9fd3b1da38cb