Make the course AJAX load less jarring

Unfortunately the course ajax has a horrible visual jump and we can't just use jsenabled to eliminate it since its conditional on the ajaxenabled setting.

The main problem is the move icons because they are changed from move buttons to a drag handle, and that changes the size of empty sections (making the affect really noticeable).

Some thoughts:

1/ Potentially use yui transition to make the effect less startling: http://yuilibrary.com/yui/docs/transition/transition-view.html
2/ Use some other CSS class hiding based on settings?