convert to ASCII coding

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@251 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update diag1.Rd

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/r2mlwin@252 edb9625f-4e0d-4859-8d74-9fd3b1da38cb