Upgrade/jmarchan double ecal gain run3

To port fix by @kreps to original branch and to MR !112 (merged)

This will be done after the tests, since we need to use the branch with 'upgrade/' in its name.

mentioned in merge request !112 (merged)

added 3 commits

• 7de57930...a3927fa2 - 2 commits from branch jmarchan-doubleEcalGainRun3
• 64d84537 - Fix conflict to back port fix by @kreps

Compare with previous version

changed the description

cc: @gcavalle

merged

mentioned in commit e08a1103