- code quit more cleanly when the is no background cache and no blank in file

- background cache was saved in both ptrms_lib and ptrms_lib interface

Correction bug test EBAS

See merge request dev/actris_ptrms_concentration_converter!3

In case file has no blank points and no background cache is available, the processing is interupted

- the code wasn't checking if the directories existed

feat: add raw data filtered available in lev1 output

See merge request dev/actris_ptrms_concentration_converter!2

Traitement L1 ionicon quad

See merge request dev/actris_ptrms_concentration_converter!1