- filename - a string that specifies the filename,
- if it is not suffixed with .nc, .nc will be added
- list of variable - a list of geodat.nc.Variable objects, can be a single
- geodat.nc.Variable
- overwrite - a boolean. Overwrite existing file if True.
- default=False
- recordax - an integer. Specify the axis that will be the
- record axis, default = -1 (no record axis)
- appendall - a boolean. Append to existing file if True.
- default = False
This function, however different from other functions in the module,
uses NetCDF4 Dataset to write data
