[Proj] RFC2: Initial integration of "GDAL SRS barn" work

[Even Rouault]

Hi,

I've submitted RFC2: Initial integration of "GDAL SRS barn" work
for consideration in https://github.com/OSGeo/proj.4/pull/1149

A HTML build of the RFC be found at
http://even.rouault.free.fr/proj_cpp_api/rfc-2.html for easier reading

I suggest to use GH commenting features in this ticket.

Even

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