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Features
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- Add view `inspector` to see internals of the rendered view or object. This
view can only be accessed as global administrator (the one who is able to
create new address books).
Bugs
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- Fix configuration error which might prevent the start-up in 2.8.
Other
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- Rework roles management for administrators to allow in future permissions
which administrators do not get by default.
- Bring test coverage including branches to 100 %.