Author: Rajesh Taneja
MDL-32759 Assignment: Changing grade for existing assignments will show warning that grades will not be scaled
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2b59c687962aedc8b570a2c241cd1ae13703e220
http://github.com/moodle/moodle/commit/2b59c687962aedc8b570a2c241cd1ae13703e220
+ 2.2 en [changegradewarning,mod_assignment]