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

Phys/DaVinci/python/DaVinci/algorithms.py

@@ -144,7 +144,6 @@ def define_fsr_writer(options):
     Returns:
        - list of FSR algorithm instances to be configured.
     """
-    from Gaudi.Configuration import INFO
     from PyConf.Algorithms import GenFSRMerge, RecordStream
 
     algs = []