CONTRIB-4789 :: Questions have required flag when they are not required

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4787 :: email non-respondents in an anonymous questionnaire

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CONTRIB-4800 :: Enable teachers to preview template or public questionnaires located in courses where they are not enrolled

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
Version 2.5.8 Build - 2013122200 ready for Moodle plugins Directory.

Signed-off-by: Joseph Rézeau <moodle@rezeau.org>
CCLE-2596 - Add UCLA UID to Questionnaire download all responses option
CCLE-3114 - OASA_Event

* Change permission type to allow public questionnaires.
CCLE-4171 - Update Questionnaire for Moodle 2.5

* Preventing "Show nonrespondents" page from displaying site/category managers.