startDynamicHelp and Rd2txt were exported from tools: no ::: needed

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2588 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
aspell does not find all typos

git-svn-id: svn+ssh://svn.r-forge.r-project.org/svnroot/vegan/pkg/vegan@2590 edb9625f-4e0d-4859-8d74-9fd3b1da38cb