nsem3b model

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1318 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
prediction updated (posterior probabilities used correctly now)

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1319 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
poisson.lvm bug introduced in previous commit fixed

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/lava@1320 edb9625f-4e0d-4859-8d74-9fd3b1da38cb