* Add a "View original" sidebar option.
* Rename the "View large" sidebar option to "View smaller".
* Remove the "Loading..." message when switching image sizes.
* Fix the V hotkey not working after using it once.
* Change #image-resize-link to .image-view-original link (note that
there are two of these links now, one in the notice bar and one in the
sidebar).
* Add a `data-post-current-image-size` attribute on the <body> element
and use it to control visibility of links and notices.
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