- A new assertDebuggingCalledCount has been introduced, as multiple debugging messages
may be called in some cases, for example when calling events_cron with queued events
that need to be dispatched.
- events_update_definition has been moved out of setUp as debugging messages are only
caught by our phpunit custom stuff when they are called inside tests.
Includes:
* constants refactoring
* reworked db table init
* support for $CFG->debug = -1
* functional DB tests
* fixed $DB->get_indexes() to not throw exceptions when table does not exist
* fix handling of user passwords in test db
* add debug info to exception messages
* removed unnecessary PHP debug errors from mathslib
* fixed @error suppression in get_string
* fixed PHPUnit error handler setup
* added timezone info to default install