webhelpers.markdown is a copy of Markdown 1.7, used as a fallback for
webhelpers.html.converters.markdown() if the full Markdown package is not
installed. See the Markdown website for documentation on the Markdown
format and this module. Markdown is now at version 2.x and contains new
features and plugins which are too big to include in WebHelpers. There is also
an alternate implementation called Markdown2. Both are available on PyPI. See
markdown() documentation for how to use them with WebHelpers.