[patch] Implement GADT records in HTML backend

[Isaac Dupree]

Isaac Dupree wrote:
> so, I cleaned up everything except for the GADT records situation

here's a pretty simple patch to remedy that deficiency in Haddock, it's 
independent of all my other patches.  Review?  I used this source 
declaration for testing:

-- | h1
data H1 a b where
   C1 :: H1 a b
   C2 :: Ord a => [a] -> H1 a a
   C3 { field :: Int -- ^ hello docs
      } :: H1 Int Int

-Isaac
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