* (bug 21279) Special:RevisionDelete now uses revision ID for deleted-page revisions...

* (bug 21279) Special:RevisionDelete now uses revision ID for deleted-page revisions when ar_rev_id is available.

- saved Special:RevisionDelete links from before page deletion still work as-is after deletion
- old log entries for rev-delete adjustments no longer magically switch to linking to Special:RevisionDelete with archive & ar_timestamp (they remain the same, as the links continue to work)

If you call Special:RevisionDelete using the older-style &type=archive links (using ar_timestamp as id) it will still save the same form to log for now; this may be fixed later for cases where the ar_rev_id is available.

Requires FakeResultWrapper fixes from r87803.