See merge request !1540

See merge request !1539

See merge request !1544

See merge request !1541

Closes #279

See merge request !1505

See merge request !1538

Add support for slice-based access to `GaudiHandleArray` so that the
following works:
```
   for h in myHandleArray[1:]:
     ...

   del myHandleArray[1:3]
```
However, we do not support setting the content via a slice as this would
become too complicated and is likely never needed.

Dmitri Konstantinov authored 1 year ago and Marco Clemencic committed 1 year ago

Use ROOT_CXX_STANDARD if it is already defined by ROOT, otherwise preserve previous behaviour and deduct it from ROOT_CXX_FLAGS

See merge request !1523

See merge request !1535

See merge request !1536

See merge request !1534

See merge request !1532

See merge request !1531

See merge request !1526

- RootHistogramSink: avoid having a 'registry' for each instance,
  instead keep one shared constant global in an anonymous namespace
  so it is hidden from the linker
- JSONSink: use the fact that `ofstream` closes the corresponding file
  when going out of scope
- BaseSink: use `std::set` with dedicted comparison operator instead
  of `std::map` which saves a bit of memory
- MonitoringHub: avoid one level of indirection in the type erasure
  which will type-erased function arguments to be passed in registers
  instead of forcing them to be passed through main memory
- MonitoringHub: `m_typeIndex` is an invariant once constructed, and
  does not need a type-erased function to be determined 'on the fly'

Allows to use the hiveWhiteBoard and select the right TES.
Made it backward compatible in the sense that by default TES number 0 is used seemlessly when number of threads is 1.
If several threads are used however, an error will be raised if the store is not selected explicitely

Change `GaudiHandleArray` type from `list` to `MutableSequence` and
implement the storage as `dict`, which is guaranteed to be
insertion-ordered as of Python 3. This considerably improves the speed
of `append`.

`insert` is potentially a bit slower but that is rarely used.

See merge request !1533

Closes #281

See merge request !1530

See merge request !1529

See merge request !1528

See merge request !1527

See merge request !1520

Their usage is similar to standard histograms, names are prefixed with "Root" and at this stage only non profile, non weighted versions are provided, for dimensions 1,  and 3 only.
The main difference with standard histograms is that they compute statistical data on the input on top of the strict histogram, in particular they keep sum and sum of squares of all variables so that mean and standard_deviation of the original data can be computed.
This behavior mimics Root histograms, which allows to convert the new histograms to Root ones and have the expected behavior, while the Gaudi histograms had no statistical data and their conversion to Root was somehow recomputing them (Root did) based on the histogram content. Obviously the values obtained were not correct.

Remove `print_function`, `absolute_import` and `division` imports.

Remove remaining Python2 backwards-compatibilty code.

Appending to an empty default HandleArray was not possible. Fix and add
unit test.

See merge request gaudi/Gaudi!1503

Remove deprecated `OutStreamType` property from `ApplicationMgr` and
`MinimalEventLoopMgr`.

Make the printout of `set` properties reproducible. For GaudiConfig2,
this is done via the property `repr` itself. For the legacy
Configurables, only in the `str` printout.