optional, others produce senseful error messages now if not found, fixes bug# 531, thx to Dieter Pelzel for reporting git-svn-id: https://svn.ibp.de/svn/capisuite/trunk/capisuite@50 4ebea2bb-67d4-0310-8558-a5799e421b66
git-svn-id: https://svn.ibp.de/svn/capisuite/trunk/capisuite@45 4ebea2bb-67d4-0310-8558-a5799e421b66
isn't allowed! git-svn-id: https://svn.ibp.de/svn/capisuite/trunk/capisuite@6 4ebea2bb-67d4-0310-8558-a5799e421b66
git-svn-id: https://svn.ibp.de/svn/capisuite/trunk/capisuite@3 4ebea2bb-67d4-0310-8558-a5799e421b66