vegan: CRAN relase 2.3-3

Bug fixes Fix issue #152: monoMDS (and hence metaMDS) failed when some dissimilarities were 1e16 or higher. Permutations failed with more permute control structures in estaccum, ordiareatest, renyiaccum and tsallisaccum. Indices that required at least two sampling units in specpool failed when only one sampling unit was supplied. New Features treeheight, treedist and treedive work (or refuse to work) with anomalous trees with reversed branches or negative heights. anosim, bioenv and mrpp have more robust handling of alternative input formats. More in the NEWS file in the package