Added 2nd formula for WAIC to PosteriorPredictive.r

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@244 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
Changes in examples/Example_delta-GLMM_simulation.R to clarify the code somewhat

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/nwfscassmt@245 edb9625f-4e0d-4859-8d74-9fd3b1da38cb