Author: Andrew Nicols
MDL-56516 tool_usertours: Cache tours and steps
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1093e43bdaceed02cc9330f080b9aaffb87bc41f
http://github.com/moodle/moodle/commit/1093e43bdaceed02cc9330f080b9aaffb87bc41f
+ 3.2 en [cachedef_stepdata,tool_usertours]
+ 3.2 en [cachedef_tourdata,tool_usertours]