The test suite was broken since the run_digi macro was changed some weeks
ago. Also the check for return strings was wrong in two cases. Also use the
proper namespace in the macro.

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.