Org reader: generalize code block result parsing

Code blocks can be followed by optional result blocks, representing the
output generated by running the code in the code block.  It is possible
to choose whether one wants to export the code, the result, both or
none.

This patch allows any kind of `Block` as the result.  Previously, only
example code blocks were recognized.

src/Text/Pandoc/Readers/Org.hs

@@ -399,11 +399,11 @@ exportsResults :: [(String, String)] -> Bool
 exportsResults attrs = ("rundoc-exports", "results") `elem` attrs
                        || ("rundoc-exports", "both") `elem` attrs
 
-followingResultsBlock :: OrgParser (Maybe String)
+followingResultsBlock :: OrgParser (Maybe (F Blocks))
 followingResultsBlock =
        optionMaybe (try $ blanklines *> stringAnyCase "#+RESULTS:"
                                      *> blankline
-                                     *> (unlines <$> many1 exampleLine))
+                                     *> block)
 
 codeBlock :: BlockProperties -> OrgParser (F Blocks)
 codeBlock blkProp = do
@@ -418,7 +418,7 @@ codeBlock blkProp = do
   labelledBlck      <- maybe (pure codeBlck)
                              (labelDiv codeBlck)
                              <$> lookupInlinesAttr "caption"
-  let resultBlck     = pure $ maybe mempty (exampleCode) resultsContent
+  let resultBlck     = fromMaybe mempty resultsContent
   return $ (if includeCode then labelledBlck else mempty)
            <> (if includeResults then resultBlck else mempty)
  where