Author: David Monllaó
MDL-66536 analytics: Indicators can add extra data for targets
http://git.moodle.org/gw?p=moodle.git;a=commit;h=16cb4f32a0a7531e91ed43bbe2fd62c39f37b7bc
http://github.com/moodle/moodle/commit/16cb4f32a0a7531e91ed43bbe2fd62c39f37b7bc
+ 3.8 en [washelpful,core_analytics]
+ 3.8 en [cachedef_calculablesinfo,core_cache]
+ 3.8 en [whendate,core_calendar]
+ 3.8 en [youhaveupcomingactivitiesdueinfo,core]