Merge pull request #3055 from marc1706/ticket/13192
[ticket/13192] Add method for generating valid user page links based on mod_rewrite
* marc1706/ticket/13192:
[ticket/13192] Add test for app.php in external subfolder
[ticket/13192] Use ltrim() instead of preg_replace()
[ticket/13192] Order test cases consistently
[ticket/13192] Remove app.php on mod rewrite even if app.php is outside root
[ticket/13192] Pass correct parameters and rename method to get_valid_page
[ticket/13192] Use get_valid_user_page in confirm_box() and cleanup globals
[ticket/13192] Use get_valid_user_page method in build_url function
[ticket/13192] Add method for generating valid user page links
