Notes:
Release Notes - Sat4j - Version 2.3.4
** Bug
* [SAT-91] - MSS that are computed by AllMUSes class are not always maximal in the group case
* [SAT-95] - OptToPBSATAdapter does not always return an optimal solution
* [SAT-101] - CSReader doesnt throws a ContradictionException when adding conflicting clauses.
** Improvement
* [SAT-96] - Allow Sat4j to provide unsat proofs in RUP format
* [SAT-98] - Allow hybrid lexico optimization
* [SAT-100] - Create a specific event when learning unit clauses
** New Feature
* [SAT-99] - Added unsat proof capability to Sat4j
