Adding option to run SUSYTools with METMaker muon-pflow fix

John Kenneth Andersrequested to merge
janders/athena:ST_METFix into 21.2

This MR adds the option to configure the METMaker muon-pflow fix from a SUSYTools configuration file/in SUSYTools.

Tagging @salderwe

Cheers

John

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