Gravatar import support. Moving avatars to subdirs to avoid huge directories.
Updating dropzone.js to support error message in return from XHR
Implementing a queue for uploaded avatars. 'Save Changes' must be clicked.

...to apply new avatar or confirm deletion of old one. If multiple
files are uploaded, only the most recent will take effect.
Changes to subforum buttons to make them more visible.
If we can't pull out the filename, skip stash element.