PyUtils: Make ##Params storage technology explicit
Tools/PyUtils/python/AthFileLite.py: Extract file GUID in a more Pythonic way Tools/PyUtils/python/MetaReader.py: idem
Related to ATEAM-960
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Tools/PyUtils/python/AthFileLite.py: Extract file GUID in a more Pythonic way Tools/PyUtils/python/MetaReader.py: idem
Related to ATEAM-960