add back HepMCReadFromFile to TruthIO

See merge request !30972

Fixing three Pythia8/MadGraph issues in 21.6

See merge request !30959

Looking through these, there are more modern ways they should be done in
job options. I haven't identified any use of these functions in anything
running in release 21.6, so removing them for now. If we need to add
them back in later, we always can do, but I expect we won't need to.

First issue: we need to make sure there is a good default for the PDG
IDs to merge in SUSY jobs (the default is now set in the preinclude).

Second issue: we should make sure that if the user is loading a model
that isn't the standard SUSY model, but still wants to use the SUSY
infrastructure, the job doesn't crash because of our attempts to provide
helpful definitions.

Third issue: Historically, Pythia8 had a problem that if "guess" was
used for merging, it would crash during initialization. That was worked
around by setting the merging to a dummy process during initialization
and then setting the code back to using guess. Recently (Pythia8 244 at
least), merging stopped passing any events. It appears that by removing
the work-around, "guess" does not crash the job during initialization
(so the Pythia8 people fixed that bug), and the merging now works (so
there must have been some change to initialization that requires guess
to be set already there).

Pythia8_i: fix enhance hook to manually take into account event weight

See merge request !30929

Frank Siegert authored Mar 06, 2020 and Ewelina Maria Lobodzinska committed Mar 06, 2020

We have to manually multiply the enhancement weight (`enhanceHooks->getEnhancedEventWeight()`) to the event weight. Unfortunately in addition, this weight is not properly initialised in Pythia, so we can't just generally do this for all UserHooks but have to specifically do it only for enhancing hooks.

Fixes AGENE-1802 and amends af1f917b

Include new EW scheme for Z production

See merge request !30932

... in particular to allow specifying sinThetaW and mZ simultaneously at the expense of mW.

Fixes AGENE-1823

Fix for Sherpa_i fusing base fragment

See merge request !30519

21.6 MadGraphControl tests, including SUSY

See merge request !30727

Update filters to GeneratorFilters-00-03-71 tag

See merge request atlas/athena!30865

This moves an import from the top to the bottom of a file, so that an
import * is no longer necessary.

update Powheg to ATLASOTF-00-04-03

See merge request !30723

Cleanup of MadGraphControl

See merge request !30557

catch edge cases in weight-name cleaning

See merge request !30688

Should say <50 characters

This adds the first tests for the SUSY setup, for a gridpack production
and LHE file making off of the gridpack. It was an opportunity for
further cleanup and for the baby steps towards really pulling out the
'SUSY' part of MadGraphControl and isolating it. Adding a test for the
setup that I'm currently debugging.

At the same time, adding a -nojpeg flag to the output by default. This
should speed up production a bit, since we get to avoid the production
of Feynman diagram pictures that we don't need.

21.6 mg

See merge request atlas/athena!30579

Normalizing SUSY functions so that they preserve functionality but look
much simpler and cleaner

This patches the 9th MGC test, which uses a gridpack and madspin. There
were some extensive changes required to get madspin working with the
gridpack -- it turned out that this mode was not really being tested
previously. Along the way, some more simplifications were possible.

MadGraphControl interface updates

See merge request !30517

remove ART tests using Generate_tf transform and update to Pythia8.244p3

See merge request !30482