latex fix


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/easyabc@355 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
evaluation activated in vignette


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/easyabc@356 edb9625f-4e0d-4859-8d74-9fd3b1da38cb