Staff Graded Assessment - xmodule

Staff Graded Assessment - xmodule

staff grading xmodule - initial version

update staff grading: bigger button, prevent accidental multiple grade submits

staff grading xmodule - render with ajax, put js in local function

fix two small SGA bugs

fix multiple-grade-entry bug due to event propagation

add annotated file upload capability to SGA

SGA bugfix log_action

SGA fix ungraded

correct misspelling in SGA instructions

revert module_render empty line change

SGA another typo

max length on comments

(cherry picked from commit 710b6437717c2cebdedd9dec695b6be277ad3d60)