Add a new option to MATAM allowing the user to run only the first step of the pipeline.
Add a new option to MATAM allowing the user to run only the first step of the pipeline.

bonsai-team/matam,ppericard/matam,bonsai-team/matam,ppericard/matamog,bonsai-team/matam,ppericard/matamog,ppericard/matam,ppericard/matamog,ppericard/matam,bonsai-team/matam,ppericard/matamog