MaxSMT solver implementation #137
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…pression , add more tests, rename to MaxSat
… split unsat core (if the same expressions weight was equal, both of them were added to the core).
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Description
This PR implements the first versions of MaxSMT solvers. It supports PMRes core-based algorithm implemented in z3 solver. Implementation is based on the article. Also this solution implements PDMRes solver implemented in z3.
Current solution is in progress. MaxSMT solvers do not provide subotimal solving yet.