[Therion] Georeferenced PNG export problem

[Nikita Kozlov]

You can export 2 PNGs one with grid to put GCPs on, and second PNG without
grid, but exactly same size (in pixels).
And use GCPs put on first grid-equipped PNG to georeference second
"grid-free" PNG.

Grid is used only to get pixel coordinates.

Dealing with pdf and 'reverse engineering' for me seems a bit complicated
stuff,
since in addition to 6 georeference parameters, you need to deal with scale
and so on,
so I'd rather used quick and dirty solution with grid and rasters.
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