Implement poly-kinded Typeable

This patch makes the Data.Typeable.Typeable class work with arguments of any
kind. In particular, this removes the Typeable1..7 class hierarchy, greatly
simplyfing the whole Typeable story. Also added is the AutoDeriveTypeable
language extension, which will automatically derive Typeable for all types and
classes declared in that module. Since there is now no good reason to give
handwritten instances of the Typeable class, those are ignored (for backwards
compatibility), and a warning is emitted.

The old, kind-* Typeable class is now called OldTypeable, and lives in the
Data.OldTypeable module. It is deprecated, and should be removed in some future
version of GHC.

Data/Vector/Generic.hs

@@ -194,7 +194,12 @@ import Prelude hiding ( length, null,
                         showsPrec )
 
 import qualified Text.Read as Read
+
+#if __GLASGOW_HASKELL__ >= 707
+import Data.Typeable ( Typeable, gcast1 )
+#else
 import Data.Typeable ( Typeable1, gcast1 )
+#endif
 
 #include "vector.h"
 
@@ -2020,7 +2025,11 @@ mkType :: String -> DataType
 {-# INLINE mkType #-}
 mkType = mkNoRepType
 
+#if __GLASGOW_HASKELL__ >= 707
+dataCast :: (Vector v a, Data a, Typeable v, Typeable t)
+#else
 dataCast :: (Vector v a, Data a, Typeable1 v, Typeable1 t)
+#endif
          => (forall d. Data  d => c (t d)) -> Maybe  (c (v a))
 {-# INLINE dataCast #-}
 dataCast f = gcast1 f

Data/Vector/Unboxed/Base.hs

 {-# LANGUAGE MultiParamTypeClasses, TypeFamilies, FlexibleContexts #-}
+#if __GLASGOW_HASKELL__ >= 707
+{-# LANGUAGE DeriveDataTypeable, StandaloneDeriving #-}
+#endif
 {-# OPTIONS_HADDOCK hide #-}
 
 -- |
@@ -31,6 +34,9 @@ import Data.Word ( Word, Word8, Word16, Word32, Word64 )
 import Data.Int  ( Int8, Int16, Int32, Int64 )
 import Data.Complex
 
+#if __GLASGOW_HASKELL__ >= 707
+import Data.Typeable ( Typeable )
+#else
 import Data.Typeable ( Typeable1(..), Typeable2(..), mkTyConApp,
 #if MIN_VERSION_base(4,4,0)
                        mkTyCon3
@@ -38,6 +44,8 @@ import Data.Typeable ( Typeable1(..), Typeable2(..), mkTyConApp,
                        mkTyCon
 #endif
                      )
+#endif
+
 import Data.Data     ( Data(..) )
 
 #include "vector.h"
@@ -58,7 +66,10 @@ instance NFData (MVector s a)
 -- -----------------
 -- Data and Typeable
 -- -----------------
-
+#if __GLASGOW_HASKELL__ >= 707
+deriving instance Typeable Vector
+deriving instance Typeable MVector
+#else
 #if MIN_VERSION_base(4,4,0)
 vectorTyCon = mkTyCon3 "vector"
 #else
@@ -70,6 +81,7 @@ instance Typeable1 Vector where
 
 instance Typeable2 MVector where
   typeOf2 _ = mkTyConApp (vectorTyCon "Data.Vector.Unboxed.Mutable" "MVector") []
+#endif
 
 instance (Data a, Unbox a) => Data (Vector a) where
   gfoldl       = G.gfoldl