array 0.5.0.0

 - Update to Cabal 1.10 format
 - Remove NHC and Hugs specific code
 - Remove deprecated function exports `Data.Array.IO.castIOUArray`,
  `Data.Array.MArray.unsafeFreeze`, `Data.Array.MArray.unsafeThaw`,
   and `Data.Array.ST.castSTUArray`; These functions are still
   available from the "Data.Array.Unsafe" module.
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