not needed the same is done automatically by ape

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@897 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
major restructuring of functions to allow easier documentation with roxygen

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@898 edb9625f-4e0d-4859-8d74-9fd3b1da38cb