change license of ordiconsensus

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2871 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
ordiconsensus is now CRAN ready... I hope

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2872 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
polish the doc of ordiconsensus

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2873 edb9625f-4e0d-4859-8d74-9fd3b1da38cb