Fixed clang warnings, removed commented out code, and fixed 2 out of 4 gcc8...
requested to merge atsirigo/athena:Fix-clang8-warnings-in-muon-packages-ATLASRECTS-5239-1 into master
Fixed clang warnings, removed commented out code, and fixed 2 out of 4 gcc8 safety thread warnings in MuonSpectrometer/MuonCalib/MuonCalibStandAlone/MuonCalibStandAloneExtraTools
Closes ATLASRECTS-5239
Edited by Apostolos Tsirigotis