Sphinx warnings when building documentation

Issue #269 open
Nikolaus Rath
repo owner created an issue

When building the documentation with recent versions of Sphinx, there are warnings of the form

WARNING: while setting up extension ['?', 'sphinx.ext.ifconfig']: node class 'ifconfig' is already registered, its visitors will be overridden

WARNING: while setting up extension sphinx.ext.ifconfig: directive 'ifconfig' is already registered, it will be overridden

WARNING: while setting up extension sphinx_pipeinclude: directive 'pipeinclude' is already registered, it will be overridden

These are probably harmless and caused by running Sphinx repeatedly. Nevertheless, we should fix this.

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