[Backport 6.3] createOperations(): fix wrong pipeline generation with CRS that has +nadgrids= and +pm= #2003
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…nadgrids= and +pm= (OSGeo#1998) Fixes issue reported at https://lists.osgeo.org/pipermail/gdal-dev/2020-February/051749.html The generated pipeline assumes that the input coordinates for the grid transformation were related to the non-Greenwich based datum, so we must compensate for that and add logic to go back to Greenwich.
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Backport 10a8d5c from #1998