Add more complex time resolution parametrisation; allow for sigma cuts in 2D clustering; introduce chi2 cuts in 2D clustering.
Fix issue that prevents endcap clusters to pass the cluster selection
Add choice between re-calculating cluster time and resolution or taking the seed time + res
Improvements for performance-sensitive code; put time-related code into extra functions in places
Don't apply chi2 prob cut by default if time-clustering is enabled; a few minimal changes
Simplified calculations + code style
Test all cases of non-finite rec-hit energies
Merge pull request #3144 from steggema/PFClusterWithTimeFeaturesFixes

Reco -- PF clustering with time information: additions and fixes