Fix wrong use of derivingConversionRef() that caused GDAL bug #1873
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Hopefully final cut at solving the same class of bug that the one
that affected QGIS in December.
This time, this hit GDAL in the situation of
https://lists.osgeo.org/pipermail/gdal-dev/2020-January/051500.html
The bug fix for that particular issue is in
PROJStringParser::createFromPROJString()
But grepping more in the code base, I could find other potential smelly
situations (might not be issues, but better be safe than sorry),
so let's fix them too.
Bottom line is:
derivingConversionRef() should only be used for consultation, and
never to create a new ProjectedCRS()