Task return: reject use of non-current rubrics
Reject task returns that aren't using the latest of each rubric.
This is to prevent a race condition where Carol updates rubric 12, bumping to rev 1, and bulk tagging all the uses of rubric 12 rev 0. But Duska doesn't sync rubric and submits an annotation using rubric 12 rev 0. Nobody notices. Big sadness, such racey.
But we need first needs a means to detect such: related Issue #3342.