Draft: trying to fix test_lumi

@sponce here's a very messy version of my branch at the moment.

added RTA label

mentioned in issue #93 (closed)

@cagapopo Can you fix the merge conflicts here ?

mentioned in merge request !551 (closed)

@cagapopo ping could you clean this up ? It would be good to fix the test in the nightlies as soon as we can.

closed

superseded by !553 (merged)