R1:12e6106a5907

Refine bucketing and display rules for voided "Accepts" in Differential

Summary:
See PHI190. This clarifies the ruleset a bit:

- If you accepted, then the author used "Request Review" explicitly, we now show "Accepted Earlier" instead of "Accepted" in the "Reviewers" list on the main revision page. This makes it sligthly more clear why the revision is back in your review queue without picking through the transaction log.
- Instead of moving all non-current accepts into "Ready to Review", move only…