[Qgis-developer] Corrections of QgsOgrProvider implementaion of GDAL 2.0

[Mark Johnson]

>
>
> 1. No extra code will be allowed in master to handle GDAL < 2.0. QGIS
> 3.0 has a hard GDAL >= 2.0 requirement, and no code will be accepted
> to work around this requirement.


The original code did many tasks being coded multiple times
- these common tasks are written once in a extra function that is used when
needed.

The gdal portions where depreciated gdal 1* functions where used
- are also in extra functions with a switch statement for the different
versions

This was done in preparation for when gdal 1* should expire (i. E. QGIS 3).

All that needs to be done is to remove the gdal 1 portion of the switch
where the gdal 1 code is used.

Mark
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