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* Theory::staticLearning() for statically adding new T-stuff before
normal preprocessing. UF's staticLearning() does transitivity of
equality/iff, solving the diamonds.
* more aggressive T-propagation for UF
* new KEEP_STATISTIC macro to hide Theories from having to
register/deregister statistics (and also has the advantage of
keeping the statistic type, field name, and the 'tag' used to output
the statistic in the same place---instead of scattered in the theory
definition and constructor initializer list. See documentation for
KEEP_STATISTIC in src/util/stats.h for more of an explanation).
* more statistics for UF
* restart notifications from SAT (through TheoryEngine) via
Theory::notifyRestart()
* StackingMap and UnionFind unit tests
* build fixes/adjustments
* code cleanup; minor other improvements
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