Developer credits

Git commits in Moodle 2.3.x by Igor Sazonov

commit 21beddafa89ed6943483630d49689b4090dfa962
Author: Igor Sazonov <sovletig@yandex.ru>
Date:   Fri, 02 Dec 2011 00:21:07 +0800
Tag:    v2.3.0-beta

MDL-27314 quiz attempts cannot be deleted in separate groups mode.