[gdal-dev] gdaladdo enhancements for partial refresh of overviews

[Even Rouault]

Hi,

sitting in https://github.com/OSGeo/gdal/pull/8074, a few enhancements 
to gdaladdo to be able to selectively refresh only part of overviews. A 
typical use case is a VRT that mosaics a number of tiles, and where one 
updates just a few tiles after the initial .vrt.ovr has been created.

Even

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