vegandevs/vegan: CRAN release 2.4-2

<strong>vegan</strong> 2.4-2 was released in CRAN on 17/1/17. The release contains more complete NEWS. The major changes are: Fixes permutation tests in distance-based constrained ordination (issue #198, PR #199). Fixes internal scaling of scores in some constrained ordination methods. Fixes weighting in <code>intersetcor</code> Fixes issue #219 in <code>betadisper</code> permutation tests. Fixes (invisible) return object of <code>ordicluster</code>. Fixes <code>tolerance.cca</code> (issue #216). Changes scaling of biplot arrows in constrained ordination plots. Adds new argument and improves colour coding of small positive values in <code>tabasco</code>. Faster <code>nullmodel</code> generation. Faster <code>vegdist</code>. More robust handling of formula which also fixes issue #200. Updated taxonomy of dune meadow species.