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* Added Text.Pandoc.Pretty.
  This is better suited for pandoc than the 'pretty' package.
  One advantage is that we now get proper wrapping; Emph [Inline]
  is no longer treated as a big unwrappable unit. Previously
  we only got breaks for spaces at the "outer level." We can also
  more easily avoid doubled blank lines.  Performance is
  significantly better as well.
* Removed Text.Pandoc.Blocks.
  Text.Pandoc.Pretty allows you to define blocks and concatenate
  them.
* Modified markdown, RST, org readers to use Text.Pandoc.Pretty
  instead of Text.PrettyPrint.HughesPJ.
* Text.Pandoc.Shared:  Added writerColumns to WriterOptions.
* Markdown, RST, Org writers now break text at writerColumns.
* Added --columns command-line option, which sets stColumns
  and writerColumns.
* Table parsing:  If the size of the header > stColumns,
  use the header size as 100% for purposes of calculating
  relative widths of columns.
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