update read_csv in filter.py files and remove README

nnpdf_data/nnpdf_data/filter_utils/README.md

nnpdf_data/nnpdf_data/filter_utils/eic_utils.py

...a/nnpdf_data/new_commondata/ATHENA_NC_105GEV_EP/filter.py

...ta/nnpdf_data/new_commondata/ATHENA_NC_29GEV_EP/filter.py

...ta/nnpdf_data/new_commondata/ATHENA_NC_45GEV_EP/filter.py

...ta/nnpdf_data/new_commondata/ATHENA_NC_63GEV_EP/filter.py

...data/nnpdf_data/new_commondata/EIC_NC_211GEV_EP/filter.py

..._data/nnpdf_data/new_commondata/EIC_NC_43GEV_EP/filter.py

..._data/nnpdf_data/new_commondata/EIC_NC_67GEV_EP/filter.py

...data/nnpdf_data/new_commondata/EIcC_NC_15GEV_EP/filter.py

...data/nnpdf_data/new_commondata/EIcC_NC_22GEV_EP/filter.py