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LOGIC-95: fix some issues with disequality.
1. -relevant-var? is broken for !=c because it compares vars that have been rooted with vars that haven't been, when called from udpatec. 2. Because of nested vars, we need to go deeper when recovering vars, and only compare ground terms with not= when invoking a !=c constraint. TODO: for 1, we need to rethink how to maintain the constraint map in face of constraints that change the associations between vars and constraints.
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