hhh4:
- corrected isNA vector leading to wrong score function result in
  endemic-only models for 'subset's including the first time point
- improved output of optimizer messages


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/surveillance@796 edb9625f-4e0d-4859-8d74-9fd3b1da38cb