* 3.1.x:
[ticket/security-180] Use language variable for redirect error in 3.1+
[ticket/security-180] Merge if statement with previous one in 3.1.x
[ticket/security-180] Add tests for redirecting to main URL
[ticket/security-180] Always fail when redirecting to an insecure URL
[ticket/security-180] Make sure that redirect goes to full URL plus slash
[ticket/security-180] Check if redirect URL contains board URL
The user's page directory needs to be added to the redirect URL for proper
redirects outside of the forum root. Fix the unit tests accordingly.
PHPBB3-11997
The redirect function will now properly redirect to where we want it to.
It will no longer try to check if the file or directory we redirect to exist.
This will ensure compatibility with the new routes.
PHPBB3-11997
We currently do a lot of checks in order to prevent users from getting to
a 404 page. However, this logic relies on checking if a file or folder exists.
Due to the front controllers and the URL rewriting in 3.1, it is no longer
possible to rely on existing files for redirecting. This patch will take
care of properly redirecting users to front controller files. An incorrect
link will cause users to get a 404 error though.
PHPBB3-11997
There were a few error messages that a user could experience that would, previously, be without any the ability to be localized. There are some more E_USER_ERRORs that I did not change to a constant, for example the error message that is displayed if there aren't any folders in /language.
PHPBB3-9975
Due to the usage of `__DIR__` for the file includes the tests can't
be ran on systems with PHP < 5.3. Replace all occurances of
`__DIR__` with `dirname(__FILE__)`.
PHPBB3-10011
