Merge pull request #3305 from mikehearn/fee_drop

Drop fees by 10x due to the persistently higher exchange rate.

src/core.h

@@ -156,8 +156,8 @@ public:
         // to spend something, then we consider it dust.
         // A typical txout is 34 bytes big, and will
         // need a CTxIn of at least 148 bytes to spend,
-        // so dust is a txout less than 54 uBTC
-        // (5460 satoshis) with default nMinRelayTxFee
+        // so dust is a txout less than 546 satoshis 
+        // with default nMinRelayTxFee.
         return ((nValue*1000)/(3*((int)GetSerializeSize(SER_DISK,0)+148)) < nMinRelayTxFee);
     }