Fixed kevacoin difficulty calculation.

src/rpc/blockchain.cpp

@@ -64,14 +64,14 @@ double GetDifficulty(const CChain& chain, const CBlockIndex* blockindex)
 
     int nShift = (blockindex->nBits >> 24) & 0xff;
     double dDiff =
-        (double)0x0000ffff / (double)(blockindex->nBits & 0x00ffffff);
+        (double)0x0ffff0 / (double)(blockindex->nBits & 0x00ffffff);
 
-    while (nShift < 29)
+    while (nShift < 31)
     {
         dDiff *= 256.0;
         nShift++;
     }
-    while (nShift > 29)
+    while (nShift > 31)
     {
         dDiff /= 256.0;
         nShift--;