r2856 failed R CMD check

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2859 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
scores.hclust.Rd was in the wrong directory

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2860 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Usage as for an S3 method

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/vegan@2861 edb9625f-4e0d-4859-8d74-9fd3b1da38cb