This function deletes old reconstructions that have been superseded in the
data_path. It assumes that the only files in data_path are part of pastclim
(i.e. there are no custom datasets stored in that directory).
This function deletes old reconstructions that have been superseded in the
data_path. It assumes that the only files in data_path are part of pastclim
(i.e. there are no custom datasets stored in that directory).