* 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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