Add Muon-Electron Overlap removal option to SUSYTools

This merge request adds the option to perform the electron-muon overlap removal into SUSYTools.

Currently I'm labelling it as a WIP as it'll require me to update the SUSYTools references and let them sync with eos but once that's done I'll unmark it.

Note: I've updated the references, so once they're synced I'll unmark this and let the CI begin.

Everything should be synced now, so lets see how it goes.

Tagging @oducu and @salderwe

Cheers

John