[openstreetmap/openstreetmap-website] Diff upload does not allow forward references to placeholders (#1465)

[Bryan Housel]

> What would you do during diff upload to fix this?

I assumed it would take one pass over the data to assign primary keys and then a second pass to actually insert the stuff into the database.  But I do understand it's easier to have it work the way it does in a single pass.

If you don't want to change how key assignment happens, thats ok with me - it just means I'll need to change iD to reorder the relations, and also add some checks to prevent users from creating circular relation graphs (we all agree they should be avoided).

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