Introduce -blockmintxfee

src/miner.h

@@ -143,6 +143,7 @@ private:
     bool fIncludeWitness;
     unsigned int nBlockMaxWeight, nBlockMaxSize;
     bool fNeedSizeAccounting;
+    CFeeRate blockMinFeeRate;
 
     // Information on the current status of the block
     uint64_t nBlockWeight;