R1:77ef38f9a87f

Aggregate corpus data in Ferret field rows

Summary:
Ref T12819. This addresses two issues:

- One practical issue is that right now, if you search for "dog cat", and they appear in different fields (for example, "dog" appears ONLY in the title, while "cat" appears ONLY in a comment) we won't find the document. This is somewhat rare -- usually, if "dog" appears in the title, it's also repeated in the description -- but I think clearly a bug. To attack this, start automatically creating a virtual "ALL"…