Clean up & add unit tests

Developing a set of python unit tests to have a good coverage of all the DaVinci configuration scripts. As natural consequence, a clean up of the codes is also performed removing typos and simplifying the code when needed.

Addresses: https://gitlab.cern.ch/lhcb-dpa/project/-/issues/179, https://gitlab.cern.ch/lhcb-dpa/project/-/issues/180

DaVinciExamples/python/DaVinciExamples/tupling/option_davinci_tupling_from_hlt2_gaudirun.py

 ###############################################################################
-# (c) Copyright 2021-2022 CERN for the benefit of the LHCb Collaboration           #
+# (c) Copyright 2021-2022 CERN for the benefit of the LHCb Collaboration      #
 #                                                                             #
 # This software is distributed under the terms of the GNU General Public      #
 # Licence version 3 (GPL Version 3), copied verbatim in the file "COPYING".   #
@@ -15,7 +15,7 @@ import Functors as F
 from FunTuple import FunctorCollection
 from FunTuple import FunTuple_Particles as Funtuple
 from PyConf.application import make_data_with_FetchDataFromFile
-from DaVinci.ConfigurationUpgrade import run_davinci_app
+from DaVinci.Configuration import run_davinci_app
 from DaVinci.reco_objects import make_pvs_for
 from DaVinci.algorithms import add_filter
 from DaVinci import options