Eng 4792 compound index

Files under tests/scripts/plannertester/ENG-4077-prefer-filtering-index mostly reflect an overdue re-synch with the output of prior planner changes.
This kind of lag will be prevented in the future by adding the awesome ENG-4077-prefer-filtering-index suite to the default "ant plannertester" run -- so it will not pass without a proper "ant plannertestrefresh".