clone.removeAllChildren();// children get also visited
// parent in the course editor model
CourseEditorTreeNode parentCetn = (CourseEditorTreeNode) cetn.getParent();
CourseNode parent = parentCetn.getCourseNode();
CourseNode parentClone = newRunStruct.getNode(parent.getIdent());
parentClone.addChild(clone);
}
/**
* flat list of all CourseEditorTreeNodes starting from root
*