Change Details

* Use std::unordered_set instead of std::set. * Do not try to check duplicate input for coinbase. * Do the check for CheckTxInputs.

* Use std::unordered_set instead of std::set. * Do not try to check duplicate input for coinbase. * Always check duplicate input for regular transactions.

* Use std::unordered_set instead of std::set. * Do not try to check duplicate input for coinbase. * Do the check* Always check duplicate input for CheckTxInputsregular transactions.