WIP: Add support for partial orders #774
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I do not know yet if the proofs still pass, as this seems to be breaking trait resolution somehow. There are many instances (e.g. 08_haystack) where I get errors about Creusot's inability to find an instance for PartialOrdLogic but everything that used to have an OrdLogic instance should still have one, and OrdLogic implies PartialOrdLogic -- so I'm not sure what's going on there...