correction in NEWS

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpalars@148 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update vignette

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/mpalars@149 edb9625f-4e0d-4859-8d74-9fd3b1da38cb