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Adds proptests using arbtest to test the correctness of the solutions provided by the SRD and BnB search algos. I use the dep exhaustigen to build all possible solutions and then run SRD or BnB and compare the results to show that the correct solution is found. Also, BnB contains a few proptest where a UTXO pool is randonly generated, and either one or many of the UTXOs are selected as a target with the assertion that BnB will find those UTXOS as the solution while searching.