Generators: Sherpa3 compatibility for common base fragments

Syntax adjustments to support switching between Sherpa2 and 3 versions more easily in the future.

cc @ewelina @fsiegert

added Generators main labels

@fsiegert Please take a look when you have a moment in case you have feedback. Perhaps we should also steers the default PDF at this point already? Any preferences for what to do when people try to use old JO using the NNPDF include with a Sherpa3 release?

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• be7f8542 - syntax fixes

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resolved all threads

Thanks a lot for making these adjustments. They all look very reasonable and I only found a few issues that I have commented on inline.

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• db0c9db5 - address review comments

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resolved all threads

marked this merge request as ready

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• a6c7b5b5 - throw exceptions when including the wrong baseline PDF

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This merge request affects 1 package:

• Generators/Sherpa_i

This merge request affects 14 files:

• Generators/Sherpa_i/share/common/Base_Fragment.py
• Generators/Sherpa_i/share/common/EW_scheme_sinthetaW_mZ.py
• Generators/Sherpa_i/share/common/Fusing_Direct.py
• Generators/Sherpa_i/share/common/Fusing_Fragmentation.py
• Generators/Sherpa_i/share/common/Lund_Hadronisation.py
• Generators/Sherpa_i/share/common/NNPDF30NNLO.py
• Generators/Sherpa_i/share/common/NNPDF30NNLO_nf_4.py
• Generators/Sherpa_i/share/common/PDF4LHC21.py
• Generators/Sherpa_i/share/common/PDF4LHC21_nf_4.py
• Generators/Sherpa_i/share/common/Pythia8_Hadronisation.py
• Generators/Sherpa_i/share/example/simple/README.md
• Generators/Sherpa_i/share/example/simple/mc.Sh22x_Example.py
• Generators/Sherpa_i/share/example/simple/mc.Sh30x_Example.py
• Generators/Sherpa_i/share/example/simple/mc.Sh_Example.py

added review-pending-level-1 label

The system determined that CI tests (with names matching "^CITest_Trigger.*$") are not needed for this code change. They are not run. This is not an indicator to restart the job.

CI Result FAILURE (hash a6c7b5b5)

	Athena	AthGeneration
externals
cmake
make
tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 77581]

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• bd6e3c2a - use new syntax also in ART tests

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