clean up/make faster getNode code

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@854 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
removed use of iterator that made R crash with phylotorture.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@855 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
update phylotorture output.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@856 edb9625f-4e0d-4859-8d74-9fd3b1da38cb