id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
181	Missing data	Huw Lewis	Huw Lewis	"Rename and move definitions of missing data (ropp_io_mdfv, ropp_io_mdtv etc) from each separate ROPP module to ropp_utils for greater module independence. 

Now that text files are totally depractated, we can define very large 'missing' values (outside all valid ranges for any parameter).

The _FillValue attribute should also be set in the ROPP format netCDF files."	enhancement	closed	normal	4.0	ROPP (all)	3.0	fixed	missing data