From PR #1918, plus first fixes by S. Donato
further fixes by S. Donato
adjust Buildfile
clean header's includes
derive from EDProducer (since it is a producer)
fix deltaR
move PixelJetPuId.cc to HLTrigger/JetMET
remove PixelJetPuId from RecoPixelVertexing/PixelVertexFinding
Merge pull request #2042 from perrotta/fixedNewFastPv3

HLT -- Fixed new fast pv3