[ticket/11528] Instantiate $client, $driver from functional test case

Make mink test case an abstract class, instantiate $driver, $client
from its child class i.e. functional test case.

PHPBB3-11528
[ticket/11528] Call parent::tearDown in overrided tearDown method

PHPBB3-11528
[ticket/11528] Move parent::tearDown() to end of tearDown()

PHPBB3-11528
[ticket/11528] Use 'use' keyword to import classes to current scope

PHPBB3-11528
[ticket/11528] Add asserts in installation steps

PHPBB3-11528
[ticket/11528] Fix spaces and slashes as per guidelines

PHPBB3-11528
[ticket/11528] Change NULL to null

PHPBB3-11528
[ticket/12563] Adds &laquo; and &raquo; to the links in acp_styles.php

PHPBB3-12563
[ticket/12562] Add max-width to proSilver

PHPBB3-12562
[ticket/12690] Find a space

Lost a spce there ... found it ...

PHPBB3-12690
[ticket/12696] Change some parts

Change placment of ucp_register_profile_fields_before

PHPBB3-12696
[ticket/12608] Change CSS classes to prevent styling conflicts

PHPBB3-12608
[ticket/12387] Use the hash as query_id for caching

PHPBB3-12387
Merge pull request #2586 from lucifer4o/ticket/12701

[Ticket/12701] Add events to user_add function

* lucifer4o/ticket/12701:
  [ticket/12701] Add change
  [ticket/12701] Rmove before event and expand modify_data
  [ticket/12701] Add events to user_add function
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12701] Add change
  [ticket/12701] Rmove before event and expand modify_data
  [ticket/12701] Add events to user_add function
Merge pull request #2575 from lucifer4o/ticket/12691

[ticket/12691] Add core.delete_pm to funtion delete_pm

* lucifer4o/ticket/12691:
  [ticket/12691] Comment change
  [ticket/12691] Change event to core.delete_pm_before
  [ticket/12691] Add core.delete_pm to funtion delete_pm
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12691] Comment change
  [ticket/12691] Change event to core.delete_pm_before
  [ticket/12691] Add core.delete_pm to funtion delete_pm
Merge pull request #2597 from Skouat/ticket/12714

[ticket/12714] Switching the description of radio buttons to align the correct description above the listbox

* Skouat/ticket/12714:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge branch 'develop-ascraeus' into develop

* develop-ascraeus:
  [ticket/12714] Move "allow all forums" in its own dd-element
Merge pull request #2591 from rxu/ticket/12704

[ticket/12704] Improve the load time information in the footer when enabled

* rxu/ticket/12704:
  [ticket/12704] Improve the load time information in the footer when enabled