Merge pull request #1 from gem-sw/CMSSW_6_2_X_SLHC

Update
GEM RecHits Validation
Monitor Element Loop
Merged CMSSW_6_2_X_SLHC from repository gem-sw
Add new XY plots according to station of CSC Copad.
Add function to prevent crash due to lack of GEMGeometry.
If GEMGeometry is null pointer, sub functions will not be works.
(Look at plugin/MuonGEMDigis.cc and MuonGEMHits.cc)
Merged include-me0-in-2023-scenario from repository ianna
Merged gem-sim-validation-for-gemsw from repository geonmo
Info from GEMGeometry
booking ME update
bugfix
clean-up
Fixed Geometry issues
Merged GEM-ME0-Full-Sim from repository dildick
Merged GEM-SIM-DIGI-Validation from repository dildick
enable gem validation
clean-up and InputTag in cfi file
add muonGEMRecHitsValidation
clean up
Merge remote-tracking branch 'caputo-cmssw/GEMRecHitOfficialValidation' into HEAD