Fill relevant Exif 3.0 tags
There seem to be now special tags for RAWDevelopingSoftware, ImageEditingSoftware, MetadataEditingSoftware, ImageTitle and ImageEditor we might make good use of. Will need exiv2 > eb303ae63e79bf680901951c2ddcc7386f15e71b (that's after than 0.28.0)
Edited by Jens Georg