add Tonti diagrams manuscript

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[epatters]

Thanks. I'm not going to list the submission status of the Tonti diagrams paper since I have no idea how likely that is to pan out and I'd prefer not to count my chickens until they're hatched.

[jpfairbanks]

Good point. I was preparing my annual activity report and thus motivated to update this info somewhere useful. I agree we can keep it a preprint until we get the first round of reviews and see if the responses indicate a future acceptance.