Author: Eloy Lafuente
MDL-29844 Administration: Added new config for users to login for viewing profile image
http://git.moodle.org/gw?p=moodle.git;a=commit;h=ff542e5e11deea451dfb0cecee87cac90b966755
http://github.com/moodle/moodle/commit/ff542e5e11deea451dfb0cecee87cac90b966755
+ 2.1 en [forceloginforprofileimage,core_admin]
+ 2.1 en [forceloginforprofileimage_help,core_admin]