Pass writename as argument to filters.

This way filters can figure out what the target format is
and react appropriately.

Example:

    #!/usr/bin/env runghc
    import Text.Pandoc.JSON
    import Data.Char

    main = toJSONFilter cap
      where cap (Just "html") (Str xs) = Str $ map toUpper xs
            cap _ x = x

This capitalizes text only for html output.

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