Fix minimum transaction fee calculation mismatch between CreateTransaction and CreateBlock

main.h

@@ -574,6 +574,13 @@ public:
         return nValueOut;
     }
 
+    static bool AllowFree(double dPriority)
+    {
+        // Large (in bytes) low-priority (new, small-coin) transactions
+        // need a fee.
+        return dPriority > COIN * 144 / 250;
+    }
+
     int64 GetMinFee(unsigned int nBlockSize=1, bool fAllowFree=true) const
     {
         // Base fee is 1 cent per kilobyte
@@ -998,6 +1005,7 @@ public:
     {
         return !(a == b);
     }
+    int GetDepthInMainChain() const;
 };