Author: David Monllao
MDL-52269 mod_assign: Display info message if blind marking active
Only for users with mod/assign:viewblinddetails capability, as other
users will quickly notice it.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=50e954163d7fc213088562c00ad0b7e0d181f62b
http://github.com/moodle/moodle/commit/50e954163d7fc213088562c00ad0b7e0d181f62b
+ 3.1 en [blindmarkingenabledwarning,mod_assign]