Gallery issues

[lavelle]

• Selectable gallery on image upload doesn't display images – need to use the URL from the server returned after uploading
• Selectable gallery still uses <img> tags, instead of <div>s with an image background, and therefore doesn't preserve the aspect ratios of thumbnails
• Both gallery types use the thumbnail for the main image as opposed to the full-size version
• The pick button in the selectable gallery is only needed by the image upload form, but isn't optional, so appears on the executable upload form too and does nothing.
• Titles are not shown correctly