Author: Tony Butler
MDL-49220 mod_choice: Add option to allow students to preview choices
http://git.moodle.org/gw?p=moodle.git;a=commit;h=c30dbd69e730ee17a4da98ce9eae1239a849999d
http://github.com/moodle/moodle/commit/c30dbd69e730ee17a4da98ce9eae1239a849999d
+ 2.9 en [previewonly,mod_choice]
+ 2.9 en [showpreview,mod_choice]
+ 2.9 en [showpreview_help,mod_choice]