message: Remove ban if merkle root incorrect for graphene block
  The merkle root could fail because we have an incomplete set of hashes. This
  is a problem specific to graphene and doesn not happen in Xthins. Therefore
  we must not ban a node for this behaviour in graphene.
diff: @@ -144,7 +144,6 @@ bool CGrapheneBlockTx::HandleMessage(CDataStream &vRecv, CNode *pfrom)
  {
  graphenedata.ClearGrapheneBlockData(pfrom, inv.hash);
  - dosMan.Misbehaving(pfrom, 100);
  return error("Merkle root for %s does not match computed merkle root, peer=%s", inv.hash.ToString(),
  pfrom->GetLogName());
  }
  