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Drop LArClusterEM

Walter Lampl requested to merge wlampl/athena:DropLArClusterEM into master

The LArClusterEM (sliding window cluster produced by the algorithm CaloClusterMaker/LArClusterMaker was largely obsolete since egamma changed to superclusters. The only remaining client was the collision-time monitoring based on clusters. My tests indicate the egammaClusters can be used for this purpose as well, so we can finally drop LArClusterEM.

This MR changes the configuration of LArClusterCollisionTimeAlg to work on egammaClusters and switches the default value of CaloRecFlags.doEmCluster to false.

For a detailed discussion, see ATLASRECTS-5875. Closes ATLASRECTS-5875

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