Feature request: Add option to show the caption below the image over the full window width.

[acwolff]

If you click on the first thumbnail of this sample album you see that the caption is displayed below the image within the image width. However there is plenty room right and left of the caption. So it would be nice if as an option the caption can be displayed over 100% of the window width.

If you display the caption in a side panel as you see in this album it would be nice if the caption could optionally start directly below the toolbar buttons.