Remove all mentions of SIMARA

We need generic code, so we should remove/rename/replace (depending on their usage) all SIMARA mentions:

• https://gitlab.teklia.com/atr/dan/-/blob/1956acc9bbe79f6ce1b8ffba69fd3fe16cb49571/dan/post_processing.py#L51
• https://gitlab.teklia.com/atr/dan/-/blob/1956acc9bbe79f6ce1b8ffba69fd3fe16cb49571/dan/utils.py#L8