merge new developments in GH1
MC data working again.
my personal meson reconstruction for 6 and 7 Hits, called GMesonReconstruction_6and7gamma in program goat_detailed.
No PID no VETO. Proton is identified by Meson Reconstruction.
Revert "Removing un-needed GH1example"

This reverts commit 1589a830361d0ab42fddd820f984f9d19d82618d.
first idea of GHistEvent.
im and mm for eta and eta'.
added GHistEvent3Meson.
added GCheckProton. This class provides a special proton Reconstruction for my analysis.
Added GAnalysis3Mesons. This class provides Analysis for a eta or eta' mesons with 3 sub mesons.
Added GAnalysis3MesonsProton. This class provides analysis for ete or eta' with proton reconstruction.
added IM cut to GAnalysis3Mesons.
added mis. Mass cut to GAnalysis3Mesons.
Revert "Removing un-needed GKinFitter classes"

This reverts commit 283bbd07517c1fe43e91db5c51fb998261d15c80.
Added GKinFitter stuff.
first idea of GFit.
return value in GAnalysis3Mesons if all cuts passed.
added GFit to GAnalysis3Mesons.
working confidence level cut in GFit.
Added function for scaler correction in GAnalysis3Mesons, GCheckProton and GFit.
fixed ROOT naming problems in GHistBGSub and GHistTaggerBinning.