SUSYTools Backgrounds list updated

Merged Gadi Ninio requested to merge gninio/athena:21.2 into 21.2

Hello, We updated the list in the Backgrounds.txt used in SUSYTools to match the information from AMI. The cross section for tautaugammagamma was wrong, and the following samples were added: dijet, V+jets and Vgamma+jets. Thanks! cc @bochen @barak @ntamir (and sorry for the mess!)

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