some small edits

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1040 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
some tests with nested sampling

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/bayesr@1041 edb9625f-4e0d-4859-8d74-9fd3b1da38cb