Remove dead feeest-file read code for old versions

0.15.0 introduced a new feeest file format, and support for parsing
old versions was never fully added. We now simply fail to read the
old format, so remove the dead partial-implementation.

src/policy/fees.cpp

@@ -411,7 +411,6 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
     size_t maxConfirms, maxPeriods;
 
     // The current version will store the decay with each individual TxConfirmStats and also keep a scale factor
-    if (nFileVersion >= 149900) {
     filein >> decay;
     if (decay <= 0 || decay >= 1) {
         throw std::runtime_error("Corrupt estimates file. Decay must be between 0 and 1 (non-inclusive)");
@@ -420,7 +419,6 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
     if (scale == 0) {
         throw std::runtime_error("Corrupt estimates file. Scale must be non-zero");
     }
-    }
 
     filein >> avg;
     if (avg.size() != numBuckets) {
@@ -443,7 +441,6 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
         }
     }
 
-    if (nFileVersion >= 149900) {
     filein >> failAvg;
     if (maxPeriods != failAvg.size()) {
         throw std::runtime_error("Corrupt estimates file. Mismatch in confirms tracked for failures");
@@ -453,12 +450,6 @@ void TxConfirmStats::Read(CAutoFile& filein, int nFileVersion, size_t numBuckets
             throw std::runtime_error("Corrupt estimates file. Mismatch in one of failure average bucket counts");
         }
     }
-    } else {
-        failAvg.resize(confAvg.size());
-        for (unsigned int i = 0; i < failAvg.size(); i++) {
-            failAvg[i].resize(numBuckets);
-        }
-    }
 
     // Resize the current block variables which aren't stored in the data file
     // to match the number of confirms and buckets