add vertex fit electron veto decision for PAT photons
add hasPixelSeed member function for electron veto
add input variables for photon regression energy correction
initialize the new variables
keep old ClassVersion and increase it to 11
Resolve merging conflicts.
Resolve code duplications and update Photon checksum.
fix definition of SigmaIetaIphi
merge cms-analysis-tools:7_0_5-photon
Merge pull request #4330 from cms-analysis-tools/7_0_X-photon

input variables for photon regrssion energy correction