[cwconfig] Issue a warning when a "core" ctl plugin failed to load
This is often because of a missing dependency, the warning would indicate this
hopefully.
[theme]
inherit = pyramid
pygments_style = sphinx.pygments_styles.PyramidStyle
stylesheet = cubicweb.css
[options]
logo = logo-cubicweb.svg
favicon = cubicweb.ico
in_progress = false
outdated = false
canonical_url =