Missing override keywords.

Update call to copyAuxStoreThinned.

Add abstract method IAthenaOutputTool::preStream().
To be called just before streaming objects.

Introduced a new (simple) service for hacking around the issue discussed in
ATR-21753 and ROOT-10940.

This way jobs needing to access symbols from the xAOD::EgammaParameters namespace
would not have to load libxAODEgammaDict.so during the job configuration. Possibly
leading to dictionary issues down the line.

Temporarily disable this test for the AthGeneration project until the geometry dependencies can be removed/hidden.
See AGENE-1870.

There is already a library that provides the public headers and hence
the `atlas_install_headers` is redundant.

ATEAM-624 and ATEAM-626 show job failures that we suspect were caused by
modifying AuxSelection at the same time other thread tried to make a
copy of the same AuxContainer.

Avoid spurious object copy in range for.

Declare an interface library for exported headers.

SealSvc does not have any useful function any more

Suppress a couple new false positives from cppcheck 2.0.

Define an interface library for headers exported from this package.

Library dependency fixes.

Define an interface library for exported headers.

Update test reference files for new xAOD variables.

ThinningSvc is no longer used.  Remove references to it.

The code is no longer linking against AsgTools, as it was introducing
a very ugly dependency scheme, where one would need to load framework
libraries just to read xAOD files. To do this, all code using AsgTools
and StoreGate was removed.

While at it, also did the following:
  - Stopped the classes referring to each other with "versioned names".
  - Removed the custom forward declaration of DataVector, and implemented
    the forward declaration headers like they are in all the other xAOD
    packages that use such things.
  - Removed the PrintHelperFcns.h header, as its code was largely
    unnecessary. The one necessary operator was moved to the source file
    that needed it.
  - Updated xAOD::getCaloRingsReader() to return a const reference instead
    of a non-const pointer.
  - Added CLID generation for the xAODCaloRings library.
  - Removed some very outdated/misleading Doxygen documentation.

It is meant to help python code get access to all the enumerations
in the xAOD::Iso C++ namespace.

At the same time moved the ROOT6_NamespaceAutoloadHook struct into
a more hidden place, as C++ clients don't need to be exposed to it.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Implemented the instantiation of xAOD::Jet's template functions
for the dictionary generation in a bit better way.

Removed the stale src/JetTrigAuxContainer_v2.cxx source, which was
only there to confuse people...

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary.

Made sure that all potentially useful/necessary types are generated
in an organised fashion, using the helper code from xAODCore.

Removed code not necessary with modern ROOT versions.

Declared the typedef names to the generated ROOT dictionary.

Moved the pure STL types to the xAODCoreSTLDict dictionary. At the
same time fixed the comment in xAODCoreSTLDict.h about the meaning
of "3" in std::bitset<3>.