[Trivial] Set log2_work decimals to 16 in the logs

Github-Pull: #1252
Rebased-From: d83e67c

src/main.cpp

@@ -2419,11 +2419,11 @@ void static InvalidChainFound(CBlockIndex* pindexNew)
     if (!pindexBestInvalid || pindexNew->nChainWork > pindexBestInvalid->nChainWork)
         pindexBestInvalid = pindexNew;
 
-    LogPrintf("InvalidChainFound: invalid block=%s  height=%d  log2_work=%.8g  date=%s\n",
+    LogPrintf("InvalidChainFound: invalid block=%s  height=%d  log2_work=%.16f  date=%s\n",
         pindexNew->GetBlockHash().ToString(), pindexNew->nHeight,
         log(pindexNew->nChainWork.getdouble()) / log(2.0), DateTimeStrFormat("%Y-%m-%d %H:%M:%S",
                                                                pindexNew->GetBlockTime()));
-    LogPrintf("InvalidChainFound:  current best=%s  height=%d  log2_work=%.8g  date=%s\n",
+    LogPrintf("InvalidChainFound:  current best=%s  height=%d  log2_work=%.16f  date=%s\n",
         chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(), log(chainActive.Tip()->nChainWork.getdouble()) / log(2.0),
         DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()));
     CheckForkWarningConditions();
@@ -3586,7 +3586,7 @@ void static UpdateTip(CBlockIndex* pindexNew)
         g_best_block_cv.notify_all();
     }
 
-    LogPrintf("UpdateTip: new best=%s  height=%d version=%d  log2_work=%.8g  tx=%lu  date=%s progress=%f  cache=%u\n",
+    LogPrintf("UpdateTip: new best=%s  height=%d version=%d  log2_work=%.16f  tx=%lu  date=%s progress=%f  cache=%u\n",
               chainActive.Tip()->GetBlockHash().ToString(), chainActive.Height(), chainActive.Tip()->nVersion, log(chainActive.Tip()->nChainWork.getdouble()) / log(2.0), (unsigned long)chainActive.Tip()->nChainTx,
               DateTimeStrFormat("%Y-%m-%d %H:%M:%S", chainActive.Tip()->GetBlockTime()),
               Checkpoints::GuessVerificationProgress(chainActive.Tip()), (unsigned int)pcoinsTip->GetCacheSize());