message: Change TestNet ProofOfWork initial/minimal diffculty to ~uint256(0) >> 1
diff: @@ -199,7 +199,7 @@ public:
  nFirstPosv2Block = 110;
  nFirstPosv3Block = 500;
  - bnProofOfWorkLimit = CBigNum(~uint256(0) >> 16);
  + bnProofOfWorkLimit = CBigNum(~uint256(0) >> 1);
  bnProofOfStakeLimit = CBigNum(~uint256(0) >> 20);
  bnProofOfStakeLimitV2 = CBigNum(~uint256(0) >> 16);
  