new NEWS.Rd (and keep ChangeLog for older parts)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1120 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
finally fixed demo

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nacopula@1121 edb9625f-4e0d-4859-8d74-9fd3b1da38cb