ReStructuredText and Sphinx bridge to Doxygen

Packagers: PGP signing key changes for Breathe >= v4.23.0. https://github.com/michaeljones/breathe/issues/591
This is an extension to reStructuredText and Sphinx to be able to read and render the Doxygen xml output.
Download
Breathe is available from github and PyPI, the Python Package Index. It can be installed with:
pip install breathe
Documentation
The documentation is available here. Thank you to the people running Read the Docs for such an excellent service.
The source for the documentation is in the documentation
folder if you want to built it and read it locally.
Note
Breathe does not always get the attention it deserves but I am