move/convert all test to testthat

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@946 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
move/convert tbind to testthat

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@947 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
move/convert treePlot to testthat

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@948 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
move/convert treestruc to testthat

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@949 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
delete unitTests directory

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@950 edb9625f-4e0d-4859-8d74-9fd3b1da38cb