useful: added cachecreated
useful change to course_modinfo
useful changes in section_info
MDL-34397 remove  arg from seciton_info as not needed
useful change to course_modinfo (store cachecreated)
cache changes cm_info only
cache crap in course_modinfo
cache crap in get_fast_modinfo and rebuild...
cache code in course_modinfo
cache code in section_info
cache code in cm_info
MDL-34397 prevent double caching
MDL-34397 restore back static cache
squash with caches
all cache code is back