Convert raw pointer members of SeedGeneratorFromRegionHitsEDProducer to std::unique_ptr
Remove empty beginRun() and endRun() from SeedGeneratorFromRegionHitsEDProducer
Cleanup of PhotonConversionTrajectorySeedProducerFromQuadruplets(Algo)
Change edm::VecArray::push_back() to throw if it is full

I think this is more in line what one would expect from something with
vector-like interface compared to undefined behaviour. In case a check
on sizes is done before a loop, there is now push_back_unchecked()
that does not incur the small performance penalty of the comparison.
Cleanup on PhotonConversionTrajectorySeedProducerFromSingleLeg(Algo)
Reduce repeated memory allocations in ClusterShape::determineShape()
Micro-optimizing ClusterShape.cc
Add option to calculate pixel cluster shape data on demand
Convert couple of asserts to cms::Exceptions in SiPixelClusterShapeCache
Use cluster shape cache only for pixel clusters in ClusterShapeSeedComparitor
Use edm::SerialTaskQueue for synchronization for on-demand SiPixelClusterShapeCache
Replace mutable propagator members by always checking the direction from the seed
Set trajectory builder in the constuctor of ConversionTrackFinder
Deliver TkCloner to TransientInitialStateEstimator

Requested by @VinInn to ease resolution of future merge conflicts.
Move construction of four helpers from beginRun() to constructor in ConversionTrackCandidateProducer
Remove ParameterSet member from ConversionTrackCandidateProducer
Replace TrajectoryBuilder parameter with TrajectoryBuilderPSet

And leave the original TrajectoryBuilder (cms.string) parameter to the
EDProducer cfi files.

Requested by @Martin-Grunewald for migrating the configuration changes
to ConfDB.
fix a naslty dependency issue
Fix LowPtTracking_PbPb_cff.py for new TrajectoryFilter configuration

I missed this file in the earlier migration.
Add clusterShapeCacheSrc parameter to HIPixelTrackFilter constructor

HIPixelTrackFilter inherits from ClusterShapeTrackFilter that uses
ClusterShapeHitFilter (I missed this inheritance earlier).