Merge pull request #8 from mengleisun/master

add total E histograms into SignalRegion
add histo for energy subtracted for PU
Merge branch 'master' of github.com:pfs/PFCal
fix plot style
fix plot style
fix pu from event
fix bug in pumix and histo boundaries for getting x,y positions and add temporary patch
debug memory issue + plot reso and fit results
fix bug with wrong maximum and pb in getting accurate positions
summary plots
debugging continued
fix z position of gun for model 2
identify events with converted photons before Layer 0
add v26 with 4mm in HEF, fix EGReso analysis
add clusteriser + reorganise signalregion and add higgs mass reco
fix bug in absorber weighting, adding eta correction
moving common indices to HGCSSDetector class
add PU simhit into digitizer.cpp