Clean up build warnings

Issue 170, implement PR comments and clean up build warnings

Author: kayvank

dataframe.cabal

@@ -103,10 +103,10 @@ library
                       directory >= 1.3.0.0 && < 2,
                       granite == 0.3.0.5,
                       hashable >= 1.2 && < 2,
+                      mtl,
                       process ^>= 1.6,
                       snappy-hs ^>= 0.1,
                       random >= 1.2 && < 1.3,
-                      random-shuffle >= 0.0.4 && < 1,
                       regex-tdfa >= 1.3.0 && < 2,
                       scientific >=0.3.1 && <0.4,
                       template-haskell >= 2.0 && < 3,

src/DataFrame/Operations/Permutation.hs

@@ -81,7 +81,7 @@ shuffledIndices pureGen k = shuffleVec pureGen (VU.fromList [0 .. (k - 1)])
   where
     shuffleVec :: (RandomGen g) => g -> VU.Vector Int -> VU.Vector Int
     shuffleVec g v = runST $ do
-        vm <- VU.thaw v
+        vm <- VUM.generate k id --VU.thaw v
         let (n, nGen) = randomR (0, (k - 1)) g
         go vm n nGen
         VU.unsafeFreeze vm