Version 4.2.4:
* Fix a Python error when saving the file if a layer was removed from the
project and used in the configuration before
* Improve error messages about these two checks :
* "Duplicated keys in the legend"
* "Duplicated layers with different filters", only in the HTML output
Version 4.2.3:
* New checks about :
* duplicated keys in the legend
* French IGN map provider
* Fix loading the "default-background-color" in the legend
* Fix link to online documentation about "Actions"
* Add project loading time in the CFG file for testing purpose only
* Some UX issues
* Remove some code in backend
Version 4.2.2:
* Fix a Python error when logging
