Issue #2370223: Invalidate cache tags so the views wizard picks up the new entity type.
[#2349435] Checking work on seperating filters/processors by stage.

  Changes Index::getProcessors to return per-stage.
  Enables different weighting and status for processors per stage.
  Changed UI to seperate processors into different stages.
[#2349435] Checking work on seperating filters/processors by stage.

  Seperate getProcessors() into all and by stage.
[#2349435] Checking work on seperating filters/processors by stage.

  Make a single status per processor, not per-stage-per-processor.
[#2349435] Checking work on seperating filters/processors by stage.

  Correct class name for js hide/show in weight table.
[#2349435] Checking work on seperating filters/processors by stage.

  Ugly but effective extra fieldset for weight/order.
Merge branch '2349435-seperate-processors-by-stage' of git.drupal.org:sandbox/daeron/2091893 into 2349435-seperate-processors-by-stage