Private download method causes Rotor to fail (at least when not using imagecache)

It looks like prior bug reports didn't root out the cause of this issue. When not using imagecache, rotor calls theme('image', ...) to generate the img HTML. theme_image expects the path of the image file to be relative to the base_path of drupal. When using private downloads, the images should always reside outside of base_path.

This patch checks the download method and passes the full private download URL to theme_image if necessary. Setting the $getsize parameter causes theme_image to skip some checks on the $path.