. Return 404 when the disk file of a file to be downloaded does not exist (should only happen during development/testing).

. Removed result size limit when searching for sections; section search results now have links to class sites.

. Allow moving site items to a different block (REGULAR blocks only).

. Added Prev/Next button on Grade Submission page to navigate to the previous/next student. The order is based on the sorting order on the Submission List page. This feature only works on browsers that support HTML5 Local Storage.