post-LS1 all-SiPMs HO digitization
Return ISynchronize when secondary file is to be opened
Make s_productGetter thread_local rather than static.
Merge pull request #1071 from wmtan/s_productGetter_thread_local

Make s_productGetter thread_local rather than static.
Merge pull request #1067 from wmtan/SynchronizationForSecondaryInputFiles

Return ISynchronize when secondary file is to be opened
Merge pull request #1021 from abdoulline/HO_post-LS1

post-LS1 all-SiPMs HO digitization