2.26.47: refactor TRAVERSE after previous introduction of needed-in-image-p.
Introduce a PLAN object for dependency traversal; have component visit functions use it instead of the ancestor operation. Introduce an explicit ACTION-STATUS class. Introduce a PLAN-RECORD-DEPENDENCY hook for POIU. Also hush warnings around upgrade-only methods. More uniformly redirect output during testing.
Showing with 200 additions and 169 deletions