> handleControlledUnit(): New. To be fleshed out Real Soon Now.
Real Soon Now has turned into 7 years...

umbrello/petaltree2uml.{h,cpp}
- Start fleshing out function handleControlledUnit - tested so far only
  using .cat file, not .sub file.
- Remove duplicated function names in texts at uDebug() / uError()
- At function petalTree2Uml add optional bool argument requireDesign
  defaulting to true. If requireDesign is false then:
  - Do not check for root->name() == "Design"
  - Do not attempt root->findAttribute("root_category"); instead, set
    root_category to root directly.
  - Do not call umldoc->setCurrentRoot(), the current root was already set
    by the loadFromMDL call on the .mdl file (with requireDesign = true.)
  - Do not call importView() for the UseCase, Component, or Deployment view.

umbrello/import_rose.{h,cpp}
- At function loadFromMDL add optional bool argument requireDesign
  defaulting to true. Pass requireDesign into call to petalTree2Uml.

CCBUG:81364