Separate repo with problem sheets

[richfitz]

As we accumulate our own set of problem cases and what they should look like, I think it would be worth creating a separate repo for the sheets (to keep the main repo nice and light and to keep things tidy). We could also have processed output once we get a sense of what things should process to. Then that can act as a big pile of integration/regression tests.

Probably the same thing can be done for googlesheets, though we'd not store the actual sheet in that case (but just the ids to the sheet). But we would want to store the processed data.

[jennybc]

Good idea. We could have a private and public one but with same structure. Because i'm finding that people are reluctant to share their most pathological and embarrassing sheets publicly. Go figure.