[gdal-dev] gdaladdo bigtiff err but --config BIGTIFF was used

[Matt.Wilkie at yukon.ca]

> You can create external overviews with the -ro switch

Yeah, I have those. I was trying to create internal ones instead in order to use cogger ;-)

(And behind all of this, a weeping and wailing and gnashing of teeth at the upstream person or persons who decided that creating jpegs and throwing away the originals was "good enough". Oh well, my history is littered with bad calls too.)

Matt