Refactoring and improvements of the accesslib.php library including prevention of access for not-logged-in users when forcelogin enabled, improved context caching, OOP refactoring of contexts, fixed context loading, deduplication of role definitions in user sessions, installation improvements, decoupling of enrolment checking from capability loading, added detection of deleted and non-existent users in has_capability(), new function accesslib test, auth and enrol upgrade notes.

More details are available in tracker subtasks.

Based on the existing get_plugin_list_with_function. As part
of implementing this, I refactored out a
get_plugin_list_with_file function, which may also be useful.

I am not sure why I did not use these in the first instance, I don't
think Google supported SSL in the first versions of their API.

They do now, and it seems that this week they stopped supporting non-ssl
requests.

This is related to MDL-24280, the issue still persists in Chrome. The patch
fixes it for Chrome and works fine for the most major browsers.

MDL-28582 course-report: Added a nothing to display notification to the outline and complete activity reports

MDL-29224 navigation: Navigation now respects a modules onclick event when preparing navigation nodes