Polish EIC data files

Emanuele Roberto Nocerarequested to merge
240408_polish_filterfiles_1 into master

Created by: comane

This PR aims at polishing the ATHENA data files. Things that are done:

  • moved all xlsx files into a rawdata folder
  • added openpyxl to poetry extras. This is needed by pd.read_excel
  • created an athena_utils.py file so as to minimise repeated code.

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