User:Aaron/flaggedrevs timestamp column 1.18

FR deployment for r86179 schema changes:

• Deploy r97331 (removes some FORCE INDEX statements related to PK) [done]
• Run patch-fr_page_rev-index.sql but WITHOUT the "DROP COLUMN" statements (includes PK change)
• Deploy r97323 to fr_rev_timestamp (php checks column existence) in FlaggedRevsion::insert() and sync [done]
• Copy trunk/ populateRevTimestamp.php to cluster and run it (needs r93036)
• Push in the new FR code along with everything else as normal