changed the deviance function - now calls directly the C code

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lmertest@69 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
the same as previous

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lmertest@70 edb9625f-4e0d-4859-8d74-9fd3b1da38cb