Author: Andrew Nicols
MDL-82627 AI: AI Image code cleanup
http://git.moodle.org/gw?p=moodle.git;a=commit;h=52855d0bb0ed6ce853622f84a674c9054220b615
http://github.com/moodle/moodle/commit/52855d0bb0ed6ce853622f84a674c9054220b615
+ 4.5 en [gdfeaturenotsupported,core_error]
+ 4.5 en [gdmimetypenotsupported,core_error]
+ 4.5 en [invalidfile,core_error]