changes to reflect new flags with using Rcpp 0.11.0

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@847 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
convert checkdata to C++ to make it faster.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/phylobase@848 edb9625f-4e0d-4859-8d74-9fd3b1da38cb