Author: Andrew Hancox
MDL-50524 mod_assign: preventsubmissionnotingroup for multiple groups
When preventsubmissionnotingroup and a user is in multiple groups, display
relevant error messages to the user and teacher
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ee5d4eef089fb46a3ba0b0c26fe25ee2df732de4
http://github.com/moodle/moodle/commit/ee5d4eef089fb46a3ba0b0c26fe25ee2df732de4
+ 3.0 en [multipleteams,mod_assign]
+ 3.0 en [ungroupedusers,mod_assign]