An eflowCaloObject may have one cluster and N tracks, and then one would have N eflowTrackClusterLink*
for each track-cluster pair, though the cluster is always the same. We only want to add the cluster to
charged PFO once.

Adjust cluster links, that we set, to point at "sister" clusters - i.e. those that are in the CaloCalTopoCluster container (which is the only
one retained in xAOD files).

TrackParticleTPCnv: DataModel -> AthLinks.

See merge request atlas/athena!7433

TBEvent: DataModel -> AthLinks, AthContainers.

See merge request atlas/athena!7435

CLIDComps: Fix gcc8 warning.

See merge request atlas/athena!7473

removal of AmdcData package

See merge request atlas/athena!7420

Fixes for some unretrieved ToolHandles used by muons from outside the muon domain

See merge request atlas/athena!7371

Tainted string, resource leak, wrong identifier key

See merge request atlas/athena!7391

change 'writeCdo' to smart pointer to avoid resource leak

See merge request atlas/athena!7393

use smart pointer to resolve memory leak

See merge request atlas/athena!7398

Code cleanups of SCT_ByteStreamErrorSvc.cxx (preparation for ATLASRECTS-3178)

See merge request atlas/athena!7401

initialize pointers, and comment off unused variables

See merge request atlas/athena!7413

Migrate G4Atlas user actions to new UserActionToolBase

See merge request atlas/athena!7414

Manual sweep of !7367 from '21.0' into 'master: Combining CaloHitAna and ISF_HitAnalysis (ATLASSIM-3526)

See merge request atlas/athena!7422

Additional dependencies to force conditions loading in InDet_CacheCreator

See merge request atlas/athena!7429

Sweeping !7423 from 21.0 to master.
Revert "Merge branch 'CleanInDetTrackValid_21.0' into '21.0'"

See merge request atlas/athena!7441

free pointer 'f', protect string copy

See merge request atlas/athena!7442

Update TRT_TrackHoleSearch to VarHandles

See merge request atlas/athena!7443

Remove SG container check from the MuonSegmentFinderAlg

See merge request atlas/athena!7450

Sweeping !7388 from 21.0 to master.
Simplify merging scheme for LArFCS_StepInfoSD

See merge request atlas/athena!7469

AthenaPoolUtilities: A couple fixes for *AthenaPool test jobs.

See merge request atlas/athena!7404

StoreGate: Remove VarHandleBase base from Read/WriteCondHandle.

See merge request atlas/athena!7387

AthContainers: Thread-safety fixes.

See merge request atlas/athena!7385

CxxUtils: Concurrent bitset.

See merge request atlas/athena!7368

AthenaServices: Remove UserDataSvc.

See merge request atlas/athena!7403

Navigation: DataModel -> AthContainers.

See merge request atlas/athena!7430

Particle: DataModel -> AthLinks, AthContainers.

See merge request atlas/athena!7432

PrimaryDPDMaker: DataModel -> AthLinks, AthContainers.

See merge request atlas/athena!7434

TrigMuonEventTPCnv: DataModel -> AthLinks.

See merge request atlas/athena!7467

TrigMuonEvent: DataModel -> AthLinks, AthContainers.

See merge request atlas/athena!7466

TrigCaloEventTPCnv: DataModel -> AthLinks

See merge request atlas/athena!7465

TrigCaloEvent: DataModel -> AthLinks, AthContainers.

See merge request atlas/athena!7464

TrigBphysHypo: DataModel -> AthLinks.

See merge request atlas/athena!7463

MuonAGDDDescription: Fix placement of using directives.

See merge request atlas/athena!7462

gcc8 warning: catching polymorphic exception type by value.