[PROJ] Seeking clarification on PROJ support for temporal transformations

[Even Rouault]

> WKT2:2018 isn't yet published. Hopefully should come out "soon" from ISO /
> OGC.

OK, I actually see it has now been finally published !
http://docs.opengeospatial.org/is/18-010r7/18-010r7.html

And the ISO19111 spec called on the OGC side as Abstract Topic 2 was already 
available at
http://docs.opengeospatial.org/as/18-005r4/18-005r4.html

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