Ahodges/documentation/doc764

@WatsonEmily , please distribute for PM review for usability by our audience.
@jhelbert , @stroilova , @shnayder , @rocha  please review for accuracy, completeness, and level of detail, particularly wrt data czars who will need to revise scripts for post-download processing.
@mhoeber , @srpearce please copy edit.
this is the file that is not going to be produced any more as of October. We do not have such advice, and it is extremely unlikely that we would prioritizing coming up with any such advice...
by "divided" do you mean "wrapped"?