[gdal-dev] gdalinfo -mm also report n (number of grid cells that are not nodata)

[Even Rouault]

> It would be nice if gdalinfo -stats would also trigger forced recomputation
> of exact statistics. Currently there is no difference between gdalinfo with
> and without -stats if statistics already exist in metadata and
> STATISTICS_APPROXIMATE=YES is absent (standard case for existing data):
> -stats has no effect here. Forced recomputation would be a change in the
> behaviour of gdalinfo -stats.

gdalinfo already reports existing statistics, so indeed gdalinfo -stats could 
call GDALComputeRasterStatistics() to force regeneration.

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