This reverts merge request !22075

Navigation: Fix gcc9 warnings.

See merge request atlas/athena!22002

xAODJet: Generate pair_base dictionaries.

See merge request atlas/athena!22137

More pair_base dictionary fixes for InDet and MuonSpectrometer

See merge request atlas/athena!22158

RootUtils: Workaround for pyroot __pair_base issue.

See merge request atlas/athena!22163

In gcc8, std::pair derives from the (empty) base class std::__pair_base.
When ROOT makes dictionaries, it likes to strip std:: qualifiers.
When it then tries to look up cling information for a TClass,
if the lookup fails, it tries again with the std:: reinserted
for all STL classes (with TClassEdit::InsertStd()).
However, that doesn't work for __pair_base, because it's not a class
that ROOT knows about.  The upshot is that we see errors like:

  Error in <TClass::LoadClassInfo>: no interpreter information for class __pair_base<unsigned int,string> is available even though it has a TClass initialization routine.

We work around this by hooking into ROOT's TClass creation.
If we see a std::pair class, we erase the base class information
from its TClass.

Revert "Merge branch 'pyfwdbwd_warning' into 'master'"

See merge request atlas/athena!22142

Sweeping !21766 from 21.0 to master.
Egamma ART: Adding cluster plots and modifying plotting macro

See merge request atlas/athena!22133

Sweeping !22111 from 21.0 to master.
adds logical volume printout as well

See merge request atlas/athena!22132

Add tau chain option

See merge request atlas/athena!22127

Rec ex reco test tau reco march2019

See merge request atlas/athena!22087

Centralised trigger bs output setup in new jo

See merge request atlas/athena!22082

EmuStepProcessing test - newJO version

See merge request atlas/athena!21912

MET Trigger: AthenaMT algorithms for clusters and jets

See merge request atlas/athena!21852

use CachedValue::store() for the covariance/position setters (ATLASRECTS-4891)

See merge request atlas/athena!22106

Manual sweep of !22078 from 21.0 into master: Add MC16 Simulation ART jobs

See merge request atlas/athena!22084

MuonEventTPCnv: Generate pair_base dictionaries.

See merge request atlas/athena!22141

EventCommonTPCnv: Generate pair_base dictionaries.

See merge request atlas/athena!22140

InDetByteStreamErrors: Generate pair_base dictionaries.

See merge request atlas/athena!22139

LArTPCnv: Generate pair_base dictionaries.

See merge request atlas/athena!22138

MuonSimData: Generate pair_base dictionaries.

See merge request atlas/athena!22136

CaloEvent: Generate pair_base dictionaries.

See merge request atlas/athena!22135

Add SCT_DigitizationMT_test

See merge request atlas/athena!22110

TrigUpgradeTest: Cleanup CMakeLists.txt dependencies

See merge request atlas/athena!22047

Full scan muon trigger updates

See merge request atlas/athena!21872

This reverts merge request !22104

StoreGate: Update CondHandleKey::initialize() to match VarHandleKey().

See merge request atlas/athena!21998

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.

Adjust selection file to generate dictionaries for std:__pair_base classes
needed for persistency.