Don't download the external packages when running the code format checker.
This improves the run time from more than 4 minutes to less than  1 minute.
Test each file individually such that the results on CDash are shown for each
file separately.

Administrator authored 4 years ago and Florian Uhlig committed 4 years ago

Add format check in GitLab CI configuration file.
Add CMake target for format checker .
Add neede CMake files and shell scripts.
Add label in GitLab CI configuration file such that it can be
properly sorted on CDash.
The checker is disabled till we format the complete code base.