This is required by the lightbox plugin. It does not harm blogs
that do not use the lightbox plugin, but makes image links easier
to click.
References #388
properly utilize CSS classes (defined in the new file
style_fallback.css). Also added support for entering "ALT"
attributes to an <img> tag, can be used as a media property if
you add "ALT" to the list of "Media properties" in the
main configuration. (garvinhicking)