* p/ticket/10491:
[ticket/10491] Make recreate_database static.
[ticket/10491] Install board once per test run.
[ticket/10491] Move board installation into setup before class.
[ticket/10491] Set up functional tests sensibly.
This is how things used to be. Installing for each test class brings
3-4x performance penalty compared to installing once for the entire
test run. However, with a single installation for all tests an
individual test can see different data when it is invoked by itself
vs when it is executed as part of the entire test suite.
PHPBB3-10491
Users should not be deleted in tests that test user creation.
Tests should use unique user names to avoid collisions.
User deletion should use user_remove anyway.
PHPBB3-10972
Always add users, do not keep track of which users have been added.
The tests should know whether users they want exist or not.
Use more unique user names in tests for robustness.
Added some more assertions here and there.
PHPBB3-10972
PHPBB_FUNCTIONAL_URL goes into setup before class.
Drop PHPBB_FUNCTIONAL_URL check in board installation and
silent return if it is not set.
Take board installation out of constructor.
Install board in setup method.
PHPBB3-10491
* p/ticket/11202-olympus:
[ticket/11202] Custom message does not make sense here, delete it.
[ticket/11202] Check response success before content assertions.
[ticket/11202] Add a heuristic function to check for response success.
