Closes #236

See merge request !1398

See merge request !1394

Closes #240

See merge request !1392

See merge request !1391

See merge request !1393

See merge request !1390

See merge request !1389

See merge request !1388

See merge request !1387

See merge request !1386

See merge request !1384

Create a symlink to the built Python binary modules so that they can be
imported as `Package.Module` (same as it is the case once they are
installed).

When the static function TH1::SetDefaultSumw2 had been called (passing true), `Sumw2(true)` is automatically
called by the constructor of TProfile. This is a problem because in the profiles in Gaudi::Accumulators we do
not keep track of the sum of squares of weights and consequently don't set fBinSumw2 of the TProfile, which in
turn leads to a self-inconsistent TProfile object. The "fix" is to disable sum of squares explicitly.

See merge request !1385

See merge request !1383

See merge request !1382

See https://sourceware.org/bugzilla/show_bug.cgi?id=27653

See merge request !1377

Sebastien Ponce authored 2 years ago and Marco Clemencic committed 2 years ago

Separated RootHistogramSinkBase from RootHistogramSink so that this part is reusable for other sinks

See merge request !1379