Author: Sam Hemelryk
MDL-32932 mod_assign: Coding style clean up and security improvement
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2a4fbc327cc59b03ddd676768de991154b92aab0
http://github.com/moodle/moodle/commit/2a4fbc327cc59b03ddd676768de991154b92aab0
+ 2.3 en [errorquickgradingvsadvancedgrading,mod_assign]
- 2.3 en [errorquickgradingnotcompatiblewithadvancedgrading,mod_assign]