Previously, a LaTeX citation would always be parsed as a Citation
element, with the raw LaTeX in the [Inline] part.
Now, the LaTeX citation is parsed as a Citation element only if
`--biblio` was specified (i.e. only if there is a nonempty set
of references in readerReferences). Otherwise it is parsed as
raw LaTeX.
This will make it possible to simplify some things in the markdown
writer. It also makes the LaTeX reader behave more like the Markdown
reader.
Previously citations were rendered as citeproc-formatted citations
by default. Now we render them as pandoc citations, e.g. `[@item1]`,
unless the `citations` extension is disabled.
If you still want formatted citations in your markdown output,
use `pandoc -t markdown-citations`.
Previously header ids were autogenerated by the writers.
Now they are generated (unless supplied explicitly) in the
markdown parser, if the `header_identifiers` extension is
selected.
In addition, the textile reader now supports id attributes on
headers.
* Depend on text.
* Expose Text.Pandoc.UTF8.
* Text.Pandoc.UTF8 now exports toString, fromString,
toStringLazy, fromStringLazy.
* These are used instead of the old utf8-string functions.
