Ideal 2015 geometry scenario
the merged Scenario of TrackerCSA14+LS1BPixRepair was added; the details can be found in presentation from November 20th, Alignment meeting
https://indico.cern.ch/event/342234/session/0/contribution/12/material/slides/1.pdf
Fix double inversion of MET covariance matrix
replace fabs with std::abs
set the error of cross section for Pythia8
guard the nPho histograms from double counting, should fix HI issues
Merge pull request #6571 from syuvivida/73x_pythia8XSecErr

Setting the error of cross section for Pythia8
make no L1 postLS1 customizations beyond new menu if Fast Simulation detected
Add new L1Emulation sequence to all paths with simGctDigis, switch l1extra to sim or unpacked digis based on context
remove legacy simGctDigis from upgrade L1T emulation
fix python crash when no L1 simulation but customs called
updated PV label for electrons
add trackClusterRemover_cfi.py file
fix input parameters handling
cloning the TrackClusterRemover module, instead of explicitly defining it
remove some commented lines
fix customization when unschedule mode is used
no cout
initialize func ptrs and also other members, for completeness
Forward port timestamp fix to CMSSW_7_3