[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/10155] Update copyright in new migration file to 2013

PHPBB3-10155
Merge PR #1294 branch 'VSEphpbb/ticket/10155' into develop

# By Matt Friedman
# Via Matt Friedman
* VSEphpbb/ticket/10155:
  [ticket/10155] Update copyright in new migration file to 2013
  [ticket/10155] Make effectively installed test more specific
  [ticket/10155] Use more descriptive title for migration file
  [ticket/10155] Use new migration file for jQuery config update
  [ticket/10155] Update jQuery to 1.8.3