Data dict refactoring 'units' and 'long_name' #18
Description
Previously, the data dict returned by functions that read input files had 'units' and 'long_name' keyed to lists which hold the respective information in indices corresponding to the indexes of variables in the 'vars' list. In refactoring these functions, it's better to remove these lists and keep these attributes in the same object as the arrays of data -- but for backwards compatibility the keys will remain until no code needs to access them anymore.