Muon Low Energy background for Run3

Gloria Cortirequested to merge
revert-4b011219 into master

This reverts merge request !667 (merged) to reapply !645 (merged) Added MuonBkg in Configuration.py to allow a configurable setting of muon bg_suffix. This completes the enhancements to be done and therefore closes the Issue #31 (closed)

Edited by Erika De Lucia

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