- added nobs and BIC methods for hhh4 objects
- logLik.hhh4 gives warning and returns NA if non-convergent result (not error)
- logLik.twinstim gained an attribute "nobs"


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@783 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
updated NEWS

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@784 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
- logLik.hhh4() always returns class "logLik" -- also for non-convergent
  and random effects models
- plot.hhh4: pch=NA can be used to disable points for observed counts


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@785 edb9625f-4e0d-4859-8d74-9fd3b1da38cb