Before this commit, the default click event on an image result is prevented,
this include clicks inside the detail.
This commit makes sure the click happends outside the detail to prevent the default event.
When an image is selected, the detail with the full size image is displayed
on the right side of the screen (or full screen on tablet and phone).
When Javascript is disabled, the thumbnail is a linked to the full size image,
as it was before.
When the image proxy is enabled, the full size image is also proxied,
in consequence this commit increases the bandwidth usage of instances.
The detail can be closed by the close button or the Esc key.
It is possible to go to the next and previous images using the j and k keys
or the button on the top right of the screen.
the build of the themes updates:
* js/leaflet.js ( was leaflet/leaflet.js )
* css/leaflet.css ( was leaflet/leaflet.css )
* css/images ( was leaflet/images )
