Calo reco cleanups

Marco Cattaneorequested to merge
CaloReco-cleanups into 2016-patches

CaloCorrectionBase: remove redundant counter, see LHCBPS-1529

CaloMergedPi0Alg: fix possible uninitialised variable issue (Coverity ID 65169)

CaloReco: multiple fixes to uninitialised members warnings from Coverity

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