plan changes:
* move *all* timestamp management to COMPUTE-ACTION-STAMP.
* goodbye visit-dependencies, move its functionality to map-direct-dependencies,
* refactored map-direct-dependencies and co to always take a plan object.
* modified clients of map-direct-dependencies and co to pass a proper plan, or t.
Add invalid file with false if-feature to bundle.
Bump version to 3.1.0.94