SiCombinatorialTrackFinderTool_xk: Fix uninitialized VarHandleKeys.

See merge request !4737

TauAnalysisTools: Fix clang warning.

See merge request !4738

TrigEgammaHypo: const fix.

See merge request !4743

TestTools: Don't warn about missing reference files for gtest-like tests.

See merge request !4749

ALFA_Geometry: Remove unused static class member.

See merge request !4750

Externals Update, master branch (2017.09.18.)

See merge request !4759

AthenaMonitoring: const fix.

See merge request !4754

latest externals/LCG code this happens automatically out of the box.

DataModelRunTests: A few more patterns to ignore.

See merge request !4698

migrate to new method of declaring ReadHandles and Properties and add monitoring

See merge request !4712

DataVector<T>::value_type is T*.
But we need the converter functions to take  a const T*.
Update to add this const qualifier.

Remove unused static class member (that also violates ATLAS naming conventions).

Add missing const qualifier.

clang warning: unused class member.

Also fix bad use of ATH_CHECK on a non-StatusCode.

Add command line option "--concurrent-events" for AthenaMT

See merge request !4718

Migrate the xAODTruthCnvAlg to DataHandles

See merge request !4632

InDetTrackSelectorTool: Fix compilation warning.

See merge request !4691

TrigL2MuonSA: Comply with ATLAS naming conventions.

See merge request !4696

Sweeping !4621 from 21.0 to master.
fix TDAQ_RELEASE_BASE in art-task-build script

See merge request !4652

Upgrade of the M(ulti)S(econdary)V(ertex)F(inder) algorithm

See merge request !4664

TrigFTKBankGen: Fix compilation warning.

See merge request !4674

Sweeping !4517 from 21.0 to master.
Do not fail when an EventShapeDensity object pre-exists in evt store. ATLASRECTS-3508

See merge request !4681

Sweeping !4660 from 21.0 to master.
Add Event/PyDumper package back into AthSimulation

See merge request !4686

InDetTrackScoringTools: Fix compilation warnings.

See merge request !4692

L1TopoSimulation: Fix clang warnings.

See merge request !4693

TrigT1CaloByteStream: Missing const qualifier.

See merge request !4694

TrigHLTJetHypo: Fix clang warnings.

See merge request !4695

Master vp1dev

See merge request !4700

CMake: Add missing TestTools library to linking of test

See merge request !4708

DefaultTools.py had incorrect double label name.

See merge request !4706

Adds the command line option "--concurrent-events=N" which enables individual
control of the number of concurrent events as well as the number of threads in
an AthenaMT job.

If --concurrent-events OR --threads is used, the job is assumed to be MT.

If neither is set, then the job is not setup as AthenaMT.

If only one of --concurrent-events or --threads is used, the other takes the same
value (ie, same number of concurrent events as threads).

Both --concurrent-events and --threads can also be set simultaneously