[PROJ] Management of datum grid files.

[Even Rouault]

> Because in GMT we ship an full GDAL3+PROJ and I wanted to avoid the need to
> set ENV variables, I patched proj code to also look for  bin/../share/proj
> but at runtime. This means that we can install where ever and it still
> works. The question is, is there interest for such a feature in the PROJ
> itself? If yes, I can make a PR.

I believe there's interest in having a better out-of-the-box Win user 
experience. We'll have to look at the details, but IMHO definitely worth a PR.

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