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Because at least for now, that's the only way other people can actually try it out.\r\n\r\nNotable features:\r\n * First-order complete  superposition prover with splitting and extensible inferences.  (`super` tactic)\r\n * Toy SAT solver.  (`cdcl` tactic)\r\n * Proof trimming to reduce size of produced proofs.\r\n * Makes an effort to produce constructive proofs.  (Well, this was more relevant when we still had HoTT support.)\r\n\r\nIf you have any questions, please ask.  I'm just terribly busy ATM or I'd write a longer summary.\r\n\r\nI have tried to put most of the generally useful utility functions into the right modules, though there are still a few ones left in `tools.super`.\r\n * Since super heavily uses monad transformers, I have added a module for monad transformers in `data.monad.transformers`.  This also includes an explicit type-parameter preserving coercion `♯` between monads.  Unfortunately I couldn't get typeclass inference to work here, and had to declare all of the `monad_lift tactic prover_state`, etc., instances manually.\r\n * There is merge sort, but I didn't put it into the list module because it depends on `has_ordering` instead of `decidable_linear_order`.  Unfortunately there is almost no type that has both typeclasses, and I need it for `expr` which only has 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