Band names and nodata values are now correctly read in case of data formats...

Band names and nodata values are now correctly read in case of data formats other than ENVI. Improved saved metadata for all formats (mainly applies to band names and nodata values). Fixed nodata value not passed through when reading a data format other than ENVI and saving in ENVI format. Updated HISTORY.rst.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>
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