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=ddce4f4ba9ad686b42b4f391228ebabb261b2b60
http://github.com/moodle/moodle/commit/ddce4f4ba9ad686b42b4f391228ebabb261b2b60
+ 3.4 en [cachedef_coursecompletion,core_cache]