produceDigiValidationPlots.py pull request and otherwise

edited produceDigiValidationPlots.py and otherwise.

bellow is the details:
We removed default tag "gemRechits" from GEMRecHitMatcher, changed global tag to POSTLS161_V12, added one line "process.GEMRecHitAnalyzer.simTrackMatching.cscLCTInput = "" because it's not working without it, edited to make just one root file  from GEMRecHitAnalyzer, and edited runGEMSimHitAnalyzer to use as many event as I made.

Kijin