Putting the depth in the position calculator
Merged new_hgc_clusters from repository lgray
Merged new_hgc_clusters from repository lgray
Merged refs/pull/6148/head from repository cms-sw

Conflicts:
	RecoParticleFlow/PFClusterProducer/src/Basic2DGenericPFlowPositionCalc.cc
add shower axis to PFCluster for HGC
use PCA as 3D shower position calc