See merge request !504

See merge request !413

See merge request !501

- remove implicit StatusCode casts
- remove unnecessary long/StatusCode conversions

Preparation for a larger re-design of StatusCode clean up.

- fixed clash between two GaudiHive tests
- avoid artificial check step in Gitlab-CI

Fix bug in DataSvcHelpers::RegistryEntry::remove introduced in !474

See merge request !508

- make the correct job to fail in case of problems
- keep artifacts also in case of failure

Unnamed lockguards don't actually lock and don't produce
warnings.

Remove a few more trivial implicit bool/long casts of StatusCode. No
functional difference of the code.

In preparation for a larger re-design of StatusCode clean up a few
places where the code unnecessarily relies on an implicit long
type-conversion. In detail:

- ObjectVector::remove: Return the index of the deleted object as
  documented in the base class. Before it always returned 1
- RegistryEntry: Change return type of some methods from long to
  StautsCode
- IODataManager: Get rid of the S_OK/S_ERROR enum alias as this relies
  on the actual type of the StatusCode enums
- RootDataConnection: Change return type of setCompression from
  long to StatusCode

See merge request !502

So far the code could try to create a new event even if no slots were available.
This was due to the fact that there was not count of free slots.
The consequences where an exception out of range further down the road as the return code of the event creation was on top not checked properly.
This adds a free slot counter in the white board

See merge request !474

See merge request !466

Allow AthMpEvtLoopMgr to call ConcurrencyFlags::setNumProcs()

See merge request !467

pyRoot will not perform the implict conversion from a string to
a string_ref -- so add a helper which does.

- replace union with boost::variant
- replace call_ template with simpler fwd template
- add compose to compose lambdas

This allows/forces DataSvc and TsDataSvc to avoid temporary std::string
objects.

See merge request !493