[KPhotoAlbum] Annotation performance improvments

[Robert Krawitz]

I've created a new 'annotation-performance' branch with these
improvements.  If everyone agrees that they're safe, I think it would
be good to get this into 5.6; it will greatly improve performance of
annotation for people with a lot of images and groups.

-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

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