Pipeline now fails also in case of failing tests.
New CI option MergeRequest for Dart.sh wrapper which creates a special CDash label.
Use new CI option when GitLab CI runs for a merge request.

This version is an exact copy of the last revision of the trunk branch
of the old SVN repository of CbmRoor at
https://subversion.gsi.de/cbmsoft/cbmroot/trunk
The old SVN repository will still be available for read access.