Adding tests for genFSR

Davide Fazzinirequested to merge
dfazzini-gauss-tests-genfsr into master

  • Added two tests for genFSR:

    • A test to verify the FSR generation
    • A test to verify the FSR merging

  • Minor change in LbPythia/PythiaProduction.cpp to fix a bug about the cross-section names stored in the FSR

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