- In many cases the first and last wire had the same X causing
          the initial value to be inf and the fit to return nan

        - for some reason the analysis test is failing randomly on
          gitlab, I think there is an issue with disk space on some
          server causing the file to not be written properly

This reverts commit 593e9b59

        - before: taking the best couple inside the cluster
        - after: weigthed average of all couple possible in the cluster

  when splitting is requested by the user

        - output one tree per detector in a folder with associated .tree
          file

        - User can build Friends entry by hand
        - User can use .tree file as entry point to automatically
          generate friends input
        - User can use -T flag with .tree file

        - Use NPL::InputParser
        - Support Friend tree
        - Support .tree file (not fully tested yet)