now invisibly returns the ordination object

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/analogue@402 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
remove redundant code to set a default value for method argument

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/analogue@403 edb9625f-4e0d-4859-8d74-9fd3b1da38cb