cdfread.CDF globalattsget() return format not expected. attributes format conflict between cdfwrite and cdfread

[SpaceWalker162]

cdfread.CDF globalattsget() return {'attribute': [entry0, entry1]} rather than the expected {'attribute': {"0": entry0, "1": entry1}} as discussed in the doc and required by cdfwrite.CDF write_globalatts()

cdfwrite expects var_spec beng a dictionary. Yet cdfread read it to be a class. Of course it is easy to transform the VDRInfo class read by cdfread into a dictionary by VDRInfo.__dict__, but it might be more straightforward to use the same interface.