Git commits in Moodle 1.9.12 by Dongsheng Cai

commit a6df2c2e5f30ca2b73b9732c91a6fdb84dfc89fb
Author: Dongsheng Cai <dongsheng@moodle.com>
Date:   Fri, 11 Mar 2011 12:25:46 +0800
Tag:    v1.9.12

MDL-9376, disallow student to see the other users posts in max editing time, credits to Vlas Voloshin and Charles Fulton MOODLE_19_STABLE