QMLBench performance change

The QMLBench runner was down for a period starting at the beginning of February (about there) and extending for around 20 days, most likely due to the maintenance break that was effectuated around that time. In the meantime, something has affected either the sources or the system, because now we see that results are different.

A significant number of benchmarks have improved significantly in terms of performance. Some have had a performance degradation.

This needs looking into.