new instances of HLTDoublet to handle generic RecoEcalCandidate-(PF)Tau pairs

This PR defines two new instances of a HLTDoublet module:
typedef HLTDoublet<RecoEcalCandidate   ,CaloJet> HLT2PhotonTau;
typedef HLTDoublet<RecoEcalCandidate   ,PFTau>  HLT2PhotonPFTau;

It is to setup overlap modules in an e+tau HLT path with electron leg being HLT GsfElectron.  The HLT GsfElectron is a RecoEcalCandidate, not an electron (which is a case for standard HLT CfkElectron).