Author: Mark Nelson
MDL-30377 forum: do not allow users to view not yet started or expired discussions
http://git.moodle.org/gw?p=moodle.git;a=commit;h=737aefb454fca0544df35db3871ce08c2938e847
http://github.com/moodle/moodle/commit/737aefb454fca0544df35db3871ce08c2938e847
+ 2.4 en [forumbodyhidden,mod_forum]