[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/11452] Now notification_method_email checks whether user has address.

Make sure the user has an email address set before offering email
notifications. The address could be missing for whatever reason, e.g. external
authentication. This is also consistent with XMPP/Jabber now.

PHPBB3-11452
[ticket/10155] Use more descriptive title for migration file

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

PHPBB3-10155
[ticket/10741] Function to resize textarea elements

New function to automatically resize textarea elements
as user types text

PHPBB3-10741
[ticket/10741] Automatically resize textareas in prosilver and ACP

Automatically resize textareas in prosilver and ACP.

PHPBB3-10741
[ticket/10741] Do not resize textarea.no-auto-resize

Do not auto-resize textareas with class .no-auto-resize

PHPBB3-10741
[ticket/10741] Fix for browser-specific resizing of textarea

Disable browser-specific resizing only after textarea has been resized
Enable browser-specific resizing after script resizing has been reset

PHPBB3-10741
[ticket/10325] add allow forgot password option in acp

PHPBB3-10325
[ticket/10325] trigger error if forgot password option disabled

PHPBB3-10325
[ticket/10325] add new config value to database

PHPBB3-10325
[ticket/10325] fix language

PHPBB3-10325
[ticket/10325] change language var

PHPBB3-10325
[ticket/10325] fix language variable

PHPBB3-10325
[ticket/10325] fix language key

PHPBB3-10325
[ticket/10325] improve acp option language

PHPBB3-10325
[ticket/10325] fix language in acp and ucp

PHPBB3-10325
[ticket/10325] add logout function in functional_test_case

PHPBB3-10325
[ticket/10325] functional tests for forgot password functionality

PHPBB3-10325