Develop script to compare multiple augmented diffs

And report discrepancies between the two.

This will be run against the two aug diff streams we're currently hosting via mojodna/overpass-diff-publisher. If there are any discrepancies, we should take a closer look at overpass and the diff publisher.

Start by identifying the two augmented diff streams currently hosted through mojodna/overpass-diff-publisher and determine how each stream can be read and compared. Done means the script reports discrepancies between the streams and makes it clear when overpass or the diff publisher needs closer investigation.

Written by the indexing model from the issue text.