- At handling of (objType == "ClassDiagram" || objType == "UseCaseDiagram"),
  choose Uml::DiagramType and umlDoc->rootFolder() according to objType.
- At the code past the (parentPkg_sav != NULL) return,
  - Remove call to importLogicalView(); the code farther above in effect
    performs importLogicalView() but at the same time deals with controlled
    units. Perhaps should be refactored for clean separation of these tasks.
  - Move call to importLogicalPresentations(root, "root_usecase_package") to
    the "import Use Case View" section.