MCTruthClassifier : Remove obsolete comments, qualify auto, tidy a bit the code

MCTruthClassifier : Remove obsolete comments, qualify auto, tidy a bit the code

Build area was cleaned as per request posted in the DB. The full software build will be performed

This merge request affects 1 package:

• PhysicsAnalysis/MCTruthClassifier

This merge request affects 3 files:

• PhysicsAnalysis/MCTruthClassifier/MCTruthClassifier/MCTruthClassifier.h
• PhysicsAnalysis/MCTruthClassifier/Root/MCRecoToTruth.cxx
• PhysicsAnalysis/MCTruthClassifier/Root/MCTruthClassifierGen.cxx

Adding @zmarshal as watcher

added Analysis analysis-review-required main review-pending-level-1 labels

removed analysis-review-required label

added analysis-review-approved label

Approving from analysis side. Tong (AR)

CI Result SUCCESS (hash 383fa80a)

	Athena	AthGeneration	AnalysisBase	AthAnalysis
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 7269] (remote access info)

added review-approved label

removed review-pending-level-1 label

merged

mentioned in commit 5ac5dba3