Author: Charles Fulton
MDL-41256 course: improved debugging on course creation
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9930e4267cd26cd0ec1d697a10db0a55d3e3a704
http://github.com/moodle/moodle/commit/9930e4267cd26cd0ec1d697a10db0a55d3e3a704
+ 2.6 en [courseidnumbertaken,core_error]
+ 2.6 en [idnumbertaken,core_error]
+ 2.6 en [shortnametaken,core_error]