We can just set `action.transitionable = false` to make the action instant.
Also removes the `onCompletion` handlers. They shouldn't really be needed,
because the validator will run after the fix is applied (and at other times).
Use spherical distances for very close nodes validation
Don't flag very close nodes from different ways
Don't flag very close nodes if both have interesting tags
Update very close nodes validation reference string
Bryan Housel