MDL-44980 quiz statistics report : break down by variants failing

when there has only been one variant seen.
MDL-44981 quiz statistics report : Differentiating '0' and no response

in numeric questions.
MDL-45038 modinfo: added property section_info::modinfo
MDL-40063 mod_quiz: replaced 'view' and 'view all' add_to_log calls with events
MDL-40063 mod_quiz: replaced 'editquestions' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'addcategory' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'delete attempt' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'report' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'review' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'view summary' add_to_log call with an event
MDL-40063 mod_quiz: removed 'close attempt' add_to_log call
MDL-40063 mod_quiz: replaced 'edit override' add_to_log call with events
MDL-40063 mod_quiz: replaced 'delete override' add_to_log call with events
MDL-40063 mod_quiz: replaced 'continue attempt' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'preview' add_to_log call with an event
MDL-40063 mod_quiz: replaced 'attempt' add_to_log call with an event
MDL-40063 mod_quiz: replaced ‘manualgrade’ add_to_log call with an event
MDL-40063 mod_quiz: created 'override_created' events
Merge branch 'wip-MDL-45038-master' of git://github.com/marinaglancy/moodle
Merge branch 'MDL-44980-master-v2' of git://github.com/jamiepratt/moodle