tauRec: thinning of CaloCalTopoClusters_links for tau clusters

Hello,

This MR adds the functionality to thin the CaloCalTopoClusters_links container and only keep the entries associated with tau clusters. This container is needed for the tau cluster-to-cell navigation in xAODs, but it is too large to be written out without thinning. As discussed in ATLTAU-1733, the CaloClusterCellLinkContainer thinning was not supported so far, and Scott just implemented it (not merged yet). Once it's in Athena, the CaloCalTopoClusters_links size should be reduced significantly (I'm already adding the container to the xAOD output to minimise the number of MRs, so we expect a jump in xAOD size, ATLASRECTS-5684). According to q221 run on 40 events, thinning reduces the container size by a factor of 2.5 (3.0 kb/evt after thinning).

Cheers, Bertrand

Calorimeter/CaloExample/CaloRecEx/share/CaloRecOutputItemList_jobOptions.py

@@ -195,13 +195,17 @@ for theKey in CaloClusterKeys: #Fixme .. Apply this only to TopoClusters?
      AuxListItem="xAOD::CaloClusterAuxContainer#"+theKey+"Aux"
      for moment in AODMoments:
          AuxListItem+="."+moment
-         pass
+     # for tau clusters
+     if theKey == "CaloCalTopoClusters":
+         AuxListItem += ".CellLink"
      if len(AODMoments)==0: AuxListItem+="." 
      CaloClusterItemList+=[AuxListItem]
 
 # write the link only for egClusterColl
 #CaloClusterItemList+=["CaloClusterCellLinkContainer#egClusterCollection_links"]
 
+# for tau clusters (CaloCalTopoClusters within 0.2 of the tau axis)
+CaloClusterItemList += ["CaloClusterCellLinkContainer#CaloCalTopoClusters_links"]
 
 CaloAODList+=CaloClusterItemList
 
@@ -216,4 +220,3 @@ CaloAODList+=["TileMuContainer#TileMuObj"]
 
 # LAr noisy Feb/PA summary
 CaloAODList +=  ["LArNoisyROSummary#LArNoisyROSummary"]
-