* Read the project config only if it exists
This avoid trying reading the file and have the control flow based
on errors. Beside that it helps troubleshooting when we have some
logging (debug level only).
* formatting only
* Adjust log level
There was some command parsing with failure in case it started with fail. That is
IMO less transparent. Now we prepare more explicit with a failure from outside. This
enables us to prepare an error like we expect it in the free wild.
* Export general configuration - part 2
First part in #956 missed to export the elements of the struct ...
* Add comment for exported struct
* Add function for opening config files
