Replaced any TMatrix and TVector by SMatrix and SVector in MET significance code
comments cleaning
Replaced any TMatrix and TVector by SMatrix and SVector in MET significance code
comments cleaning
Merge branch '72X_METMatrixChange' of github.com:mmarionncern/cmssw into 72X_METMatrixChange
Merge pull request #5417 from mmarionncern/72X_METMatrixChange

Replacement of TMatrix and TVector by SMatrix and SVector in MET code