devfuns are based again on the theta parameters
this removed the bug from carrots data 2 slopes with correlations
ss and ms type 3 are added and type 1 updated - differences are remained between lme4

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lmertest@71 edb9625f-4e0d-4859-8d74-9fd3b1da38cb