remove functions and doc now in vegan3d
Update documentation for removed rgl.isomap and rlg.renyi

Build fails now because NAMESPACE contains non-existing functions.
update DESCRIPTION and NAMESPACE for removed functions

Removes scatterplot3d and rgl from Suggests and Imports.
update links to vegan3d functions in man pages
adonis accepts permutations=0

This allows evaluation of the statistic only and allows embedding
adonis in, say, oecosimu.
anosim acceptes permutations = 0
mrpp works with permutations = 0

mrpp is multiresponse *permutation* procedure: it may not produce any
sensible result without permutation, but what am I to say what people
should do.
print no. of permutations also with zero permutations in mrpp
Merge pull request #38 from jarioksa/zero-permutations-should-be-accepted

Zero permutations should be accepted
print of anosim adapted to the new permute API

No more stores 'strata', but 'control' and uses howHead() to show
its result.

It seems that getPermuteMatrix(..., strata=<name>) does not save the
name of the 'strata', but howHead() just prints "Blocks: strata".
adapt envfit printing to the new permute API: no more strata
mantel printing to the new permute API: no more strata
mrpp printing to the new permute API: no more strata
SSarrhenius works when some observations have zero species

Selection of starting values failed when some observations had zero
species, because we initialize as lm on log(S). The actual fitting had
no problem with these same observations. We now use pmax(S, 1) to get
starting values -- which of course can be a worse now.

The problem was reported by Sara Landi of Siena.
Merge pull request #37 from jarioksa/remove-vegan3d-functions

Remove vegan3d functions
adonis adds howHead() to the heading of the anova table

The permutation information is printed similarly as in
anova.cca.
remove dangling '.' from the output
mso adds "control" attribute to the "vario" item and howHead() shows it
Add empty line between results and permutation details
simper adds "control" attribute for permutations and summary prints it