[ansel] Add next/back links to the screen view

[Ben Chavet]

This doesn't really look that great with the default theme.  I'm thinking it'd
look better in the top area where all of the other links are for the image. 
Maybe on the right side of the filename-bar?  I'll play with it in different
locations & send some screenshots.

--Ben

Quoting Brian Keifer <brian at valinor.net>:

> Quoting Brian Keifer <brian at valinor.net>:
>
> > Here's a patch to add 'next' and 'back' links to the screen view to
> navigate
> > between images without having to go back to the gallery view.
>
> ...and there's a screenshot here:
>
> http://valinor.net/ss/ansel-next-back-links.jpg
>
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