fixup lbfgsb and minor nls14


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimizer@861 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
add bounds test


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/optimizer@862 edb9625f-4e0d-4859-8d74-9fd3b1da38cb