changed roles of Florian, Thomas, Anja Hueller, Eleonara Feist to contributors

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/distr@985 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
a little more details on "contribution" by Florian, Anja, Eleonara, Thomas

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/distr@986 edb9625f-4e0d-4859-8d74-9fd3b1da38cb