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
Merge pull request #37 from jarioksa/remove-vegan3d-functions

Remove vegan3d functions