Author: Stephen Bourget
MDL-32135 mod_choice: Open time should be before close time
http://git.moodle.org/gw?p=moodle.git;a=commit;h=5d3821ebccc397e95ada76fc1ef90622f49af2bb
http://github.com/moodle/moodle/commit/5d3821ebccc397e95ada76fc1ef90622f49af2bb
+ 3.2 en [closebeforeopen,mod_choice]