Particle Flow for HGC -- for SLHC16

[lgray]

This PR contains a preliminary version of particle flow that includes the HGC.
Charged/neutral hadrons and photons are now reconstructed in the HGCal, but many details need to be filled in. Track-cluster linking is in place in this version so charged pions can be studied and refined.

This PR includes #4551 from @pfs, but should merge properly if #4551 goes in first.

Barring any problems that the present testing (min bias, simple jet gun, pion gun, electrons, pi0s) hasn't found, this should go in SLHC16.

@vandreev11 @pfs @amagnan

[cmsbuild]

A new Pull Request was created by @lgray (Lindsey Gray) for CMSSW_6_2_X_SLHC.

Particle Flow for HGC -- for SLHC16

It involves the following packages:

Configuration/Geometry
DataFormats/ParticleFlowReco
FastSimulation/BaseParticlePropagator
Fireworks/Geometry
Geometry/CMSCommonData
Geometry/FCalGeometry
Geometry/HGCalSimData
RecoLocalCalo/HGCalRecProducers
RecoParticleFlow/PFClusterProducer
RecoParticleFlow/PFProducer
RecoParticleFlow/PFTracking
SLHCUpgradeSimulations/Configuration
SimCalorimetry/HGCSimProducers
SimGeneral/MixingModule

The following packages do not have a category, yet:

Geometry/FCalGeometry
Geometry/HGCalSimData
RecoLocalCalo/HGCalRecProducers
SimCalorimetry/HGCSimProducers

@civanch, @Dr15Jones, @lveldere, @ianna, @mdhildreth, @cmsbuild, @alja, @nclopezo, @StoyanStoynev, @slava77, @Degano, @ktf can you please review it and eventually sign? Thanks.
@ghellwig, @alja, @bachtis, @wmtan this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
@fratnikov, @mark-grimes you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[lveldere]

+1

haven't reviewed in detail, but FastSim changes look reasonable

[mark-grimes]

merge

All tests pass fine. No idea why the diff here says 116 files - when merged it's only 33 and all ParticleFlow packages (or ParticleFlow DataFormats packages etcetera); or FastSim which has been approved. Modification to the customisation too which I'm happy with.

[lgray]

@mark-grimes Github is weird won't update the diff on the webpage relative to the code moving underneath it, from what I can tell. Oh never mind, I see what happened, it did update with respect to the code underneath and the merge to the other PRs brought some older commits it... A bit confusing...