High precision storage format

[vergauwenthomas]

Use binary format to save data to, not json.

[vergauwenthomas]

Another (more preferred way imo) is to convert it to netcdf in R, and write to NC file with double precision (i think this is the highest precision that the models use?)

tmp_def <- ncvar_def(name="tmp",units="deg_C",
                     dim=list(xlondim,ylatdim),
                     missval=fillvalue,
                     longname=dlname,
                     prec="double")