* Marc/ticket/11997: (23 commits)
[ticket/11997] Use functional test cases that should always work
[ticket/11997] Fix redirect tests for mod rewrite
[ticket/11997] Add user's page dir to redirect path and fix unit tests for it
[ticket/11997] Remove obsolete function get_controller_redirect_url()
[ticket/11997] Use path_helper in in foo/bar extension for redirect URLs
[ticket/11997] Add remove_web_root_path() in order to prevent incorrect URLs
[ticket/11997] Do not check if file or dir we redirect to exist
[ticket/11997] Modifiy tests after adding path_helper clean_url method
[ticket/11997] Add clean_url() method to path_helper
[ticket/11997] Allow redirects to parent folders like previously
[ticket/11997] Move expected redirect returns to controller and output to HTML
[ticket/11997] Fix tests for path_helper's get_controller_redirect_url()
[ticket/11997] Use get_controller_redirect_url() in redirect() function
[ticket/11997] Add method for controller redirect URLs to path helper
[ticket/11997] Undo changes to phpbb_own_realpath()
[ticket/11997] Remove obsolete failover_flag in function redirect()
[ticket/11997] Add functional test for redirects in controller
[ticket/11997] Fix missing global
[ticket/11997] Fix redirects from inside controllers
[ticket/11997] Use $phpbb_filesystem->clean_path() for proper redirect paths
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