edf2nx - data duplication: improve handling of dark. For now `count_time` is...

edf2nx - data duplication: improve handling of dark. For now `count_time` is not handled by nabu so we do a data duplication to handle accumulation. Not the best but will work
4 jobs for edf2nx_make_copy_of_dark_no_matter_what in 3 minutes and 22 seconds (queued for 3 seconds)