Author: Damyon Wiese
MDL-58136 cache: Add a course completion cache
The last change added 1 db read per course per page which is not OK. Add a cache to compensate.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=9a9b9e53f008d19c4306ba880ce04a8724bbefbd
http://github.com/moodle/moodle/commit/9a9b9e53f008d19c4306ba880ce04a8724bbefbd
+ 3.3 en [cachedef_coursecompletion,core_cache]