Do not use flatfield heuristic flag for data after 2023-10-10?

[morcuended]

Following an email from Seiya from Oct 11th, 2023, it's possible to not using FF heuristic flag to find calibration events for the data taken after Oct 10th, 2023.

This should be changed in the osa cfg and also in the lstchain config file used.

Might be good to analyze a date from past period to check that it is actually working.

[moralejo]

Might be good to analyze a date from past period to check that it is actually working.

The data check has a test on that - it verifies which of the heuristically-identified FF have the right flag.

I think this would stop working if you use the identification by flag (all of the "newly-defined" -via flag- FF events will have the flag ON by construction). For osa I would leave it as it is, unless you see any advantage in the change.