Markdown writer: New approach for citations.

* Reverts 1.11 change that caused citations to be rendered as
  markdown citations, even if `--biblio` was specified, unless
  `citation` extension is disabled.  Now, formatted citations
  are always printed if `--biblio` was specified.  If you want to
  reformat markdown keeping pandoc markdown citations intact,
  just don't specify `--biblio`.

* Reverted now unnecessary changes to Text.Pandoc.Biblio adding the raw
  block to mark the bibliography, and to Text.Pandoc.Writers.Markdown
  to remove the bibliography if `citations` not specified.

* If the content of a `Cite` inline is a `RawInline "latex"`, which
  means that a LaTeX citation command was parsed and `--biblio` wasn't
  specified, then render it as a pandoc markdown citation.  This means
  that `pandoc -f latex -t markdown`, without `--biblio`, will convert
  LaTeX citation commands to pandoc markdown citations.

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