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=abef0f8b058b709f8dcff1c89c484c7ea4f82762
http://github.com/moodle/moodle/commit/abef0f8b058b709f8dcff1c89c484c7ea4f82762
+ 3.0 en [closebeforeopen,mod_choice]