adding csvs as well as ncs for RIE files while waiting for EPI pipeline to stop expecting csvs by default

splitting out some csv parsing functions

splitting out some csv parsing functions

splitting out some csv parsing functions

- reformate a Dataframe to a Series,
- create bounderies for coordinates,
- check if a unit is CF convention compliant,
- create netCDF file from a Series

See ews-epidemiology commit 922332e.