Implements core_user::search function which can search through the
names (and, if allowed, other identity fields) of all users visible
to the current logged-in user, within a course context or globally.
1. getMock()
2. setExpectedException()
3. checkForUnintentionallyCoveredCode renamed to beStrictAboutCoversAnnotation
4. beStrictAboutTestSize renamed to enforceTimeLimit
5. UnitTestCase class is now fully removed.
The validation of the timezone field should not occur, especially
when it is automatically cleaned. Timezones can be volatile, we
must try hard to fallback on real timezones and must not lose reset
the values arbitrarily.
"There is absolutely no need to change $CFG->timezone and user timezones
in database - the timezones may come and go. If you change the value in
upgrade or on the fly you would not be able to get it back. This is the
reason why I implemented the "invalid timezone" thing in server and
user settings instead." - Petr Skoda (MDL-49684)
Also the get_property_definition() was created to get the property without retrieve the whole definition cache and
unit tests were created to tests those new methods.
This is used by messaging system for sending/receiving message
to/from noreply or support user. message_send api will now use
core_user class to get noreply or support user and then
send/receive message depending on user state.
