Author: Dan Marsden
MDL-46805 SCORM: AICC restricts allowed characters in the username
http://git.moodle.org/gw?p=moodle.git;a=commit;h=847de86adf0ce8cb692f32668f167b99eba25eff
http://github.com/moodle/moodle/commit/847de86adf0ce8cb692f32668f167b99eba25eff
+ 2.7 en [aiccuserid,mod_scorm]
+ 2.7 en [aiccuserid_desc,mod_scorm]