Fix 1024 on [this line](https://github.com/cernopendata/data-curation/blob/master/cms-derived-data/create_cms_derived_datasets.py#L41), it makes G(i)B -> M(i)B and gives the wrong size (see https://github.com/cernopendata/opendata.cern.ch/issues/3681). @tiborsimko Is there need for GB <-> GiB conversion here?