add stabs

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ctv@1957 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
nnclust archived on CRAN

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ctv@1958 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
highfrequency archived on CRAN

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/ctv@1959 edb9625f-4e0d-4859-8d74-9fd3b1da38cb