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2007 to WGS84 issues) (fixes #2356)
- We make createBoundCRSToWGS84IfPossible() more restrictive. If there are more
than one Helmert transformation from the CRS to WGS 84 covering the area of
use of the CRS, we do not create a BoundCRS / +towgs84
- In createOperations() filtering, we are less aggressive in discarding operations
that have the same area of use but worse accuracy. We do it only if they involve
more transformation steps.
We now get:
```
$ projinfo EPSG:5340 -o PROJ
PROJ.4 string:
+proj=longlat +ellps=GRS80 +no_defs +type=crs
$ projinfo -s EPSG:5340 -t EPSG:4326 --spatial-test intersects --summary
Candidate operations found: 2
EPSG:9264, POSGAR 2007 to WGS 84 (2), 0.5 m, Argentina
EPSG:5351, POSGAR 2007 to WGS 84 (1), 1.0 m, Argentina
```
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