Vegandevs/Vegan: Cran 2.4 Release

This is a minor release that fixes the following issues orditkplot passes CRAN tests. anova( , by = "axis") ignored partial terms. Function uses now forward testing which is less dangerously biased than the previous marginal tests. summary and inertcomp for RDA, CCA and frieds failed if constraints had zero rank. meandist labels are no longer cropped in plots. Canberra distance in vegdist can now handle negative entries in input.