In debug mode, print information about the CSV lines being read
In debug mode, print information about the CSV lines being read

This information is used by roottest-root-dataframe-
test_progressiveCSV to check the correct behaviour of the
progressive reading of the CSV data source.

root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,karies/root,karies/root,root-mirror/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,karies/root,karies/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,olifre/root,olifre/root