Author: Frederic Massart
MDL-40055 mod_assign: Replace add_to_log 'reveal identities'
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ad10ad14153a22426eac5e587c44c5a6ccbd1606
http://github.com/moodle/moodle/commit/ad10ad14153a22426eac5e587c44c5a6ccbd1606
+ 2.6 en [event_identities_revealed,mod_assign]