[gdal-dev] Return from Set/GetNoDataValue

[Even Rouault]

Hi Andrew,

> Perhaps this is a documentation issue, 

I think this is mostly an implementation issue in a niche driver. The changeset that 
introduced this ( https://trac.osgeo.org/gdal/changeset/21821 ) isn't very verbose of the 
motivation. I suspect that the intent was to benefit from PAM for a few things, but not 
wanting to generate a .aux.xml file when SetNoDataValue() is called.

I've changed this in https://trac.osgeo.org/gdal/changeset/40003 to use the PAM 
.aux.xml file to laod non-default nodata value on GetNoDataValue(), and write into PAM 
on SetNoDataValue() if the value is different than the default one. Should be a 
reasonable compromise on the presumed original intent.

Even

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