- Implemented complex and simple field hyperlinks.
- This includes a significant change to the API. The export methods are now all
called twice. The results are discarded in the first pass. In first pass
(``self.first_pass == True``), you can now track information that will be used to
make decisions in the second pass. The notable example where this technique
is used is implementing complex fields. Because the export methods are called
twice, some exporter extensions that perform lossly operations on the
document structure may need to ignore processing during the first pass.
- The function signature of the ``get_hyperlink_tag`` has changed. It
previously accepted a ``Hyperlink`` instance. Now it only accepts
``target_uri``.