Autogenerate ontology documentation.
There is now a new gtk-doc reference for ontology, which is created from data/ontologies/*. docs/tools contains the programs to generate both docbook and graphs, these are dumped on docs/reference/ontology, which is compiled afterwards. Documentation generation happens on make, ontology graphs require graphviz and are only generated on distcheck, A base image is committed, so people don't need graphviz to have a peek.
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