metadata: inconsistent Lens info
The metadata pane assume the lens model is in aux:Lens while the Exiv2 code put it in ExifEX:Lens. Ideally the Exiv2 code would fill aux:Lens too, but we must handle the case in both situation.
One of the visible consequence is if we load a RAF file, the Lens info isn't displayed. If we load a RAF+JPEG (where the Exif metadata comes from the JPEG via Exempi) it is OK as the Exempi code do both properties.
- The metadata pane doesn't handle multiple XMP properties for one
- Nor does the Exiv2 code.
This is caused by the code to resolve issue #2 (closed)