bfast 1.5.4 updates

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bfast@446 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
remove MASS from the depends

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bfast@447 edb9625f-4e0d-4859-8d74-9fd3b1da38cb