[ticket/11362] Correctly sanitise the directory path

We need to correctly remove ../ form the path if possible by removing the
previous folder aswell. Otherwise the finder is unable to locate /adm/style
directories in extensions as he is looking for /adm/../adm/style instead.

PHPBB3-11362
[ticket/11362] Add unit test for ../ in directory paths

PHPBB3-11362
[ticket/10155] Update jQuery to 1.8.3

Currently included jQuery is old by now, v1.6.2. We should update to
1.8.3. This allows us to take advantage of the latest form of jQuery
event delegation ($.on). I don't think it wise to update to jQuery
1.9.x yet, as many 3rd party scripts still need to be updated to cope
with its deprecated features ($.browser). Therefor, 1.8.3 is the latest
and most widely compatible stable version right now.

PHPBB3-10155
[ticket/10155] Use new migration file for jQuery config update
[ticket/10155] Use more descriptive title for migration file

PHPBB3-10155
[ticket/10155] Make effectively installed test more specific

PHPBB3-10155
[ticket/11485] add columns to styles table during updating schema before
updating the data

PHPBB3-10485
[ticket/11485] add revert_schema for the updated columns

PHPBB3-11485
[ticket/4412] Shorten long profile fields

Shorten long profile fields using CSS

PHPBB3-4412
[ticket/11275] Do not use document.write() for color palette

Replace document.write() for color palette function

PHPBB3-11275
[ticket/11275] Do not use spacer.gif in color picker

PHPBB3-11275
[ticket/10844] Add phpbb_root_path to phpbb_style_extension_path_provider

The phpbb_root_path needs to be removed from the style path, before giving
the path to the finder, because the finder prepends it later again and is
therefor unable to find style files when the root path is not ./

PHPBB3-10844
[ticket/10844] Make sure ext_path has no trailing slash

PHPBB3-10844
[ticket/10844] Add unit tests for different root_paths

PHPBB3-10844
[ticket/11495] Add basic interface with nestedset operations

PHPBB3-11495
[ticket/11495] Add abstract implementation of the interface

PHPBB3-11495
[ticket/11495] Add forum implementation of nestedset

PHPBB3-11495
[ticket/11495] Add unit tests for the implemented functions

PHPBB3-11495
[ticket/11362] Move phpbb_clean_path into a simple filesystem service

PHPBB3-11362
[ticket/11362] Use new filesystem class in finder

PHPBB3-11362