LumiCalc: merge website updates back into master

Several updates of iLumiCalc and associated scripts and html files have been updated for the atlas-lumicalc website over the years without ever being committed back to the git master.

This patch brings the git master back into sync with the code on the website, and provides bugfixes for iLumiCalc that had been deployed on the website.

In particular, this MR includes fixes to make LumiCalc run on Run3 data.