Core styleguide cleanup. Fixes #10586

If you are using `.data("events")` we would like to know how we can provide a documented interface that satisfies the need.

Between new 1.7 special event hooks and jQuery.event.simulate() we have a much cleaner solution than the people calling jQuery.event.handle are doing, but we shouldn't break their use of this undocumented internal interface for now.

Thanks davidmurdoch for staying with this bug!

As @timmywil points out, attributes and properties are confused by IE6/7. This commit also reworks the unit test case to do a better job of checking className matches.

Now, event.delegateTarget is always the element where the event was handled, regardless of whether delegated handlers are attached.

Logic to handle detaching by event was in both .off() and jQuery.event.remove; now it's only in .off(). It's a bit of a strange case since the event object (not the jQuery set) specifies the element.

This lets us use currentTarget for its intended use and avoids creating a non-standard delegateTarget property.

Clean up spacing in manipulation

More Details:
- https://github.com/jquery/jquery/pull/550
- http://bugs.jquery.com/ticket/10501

More Details:
 - https://github.com/jquery/jquery/pull/561
 - http://bugs.jquery.com/ticket/8388

More Details:
 - https://github.com/jquery/jquery/pull/554
 - http://bugs.jquery.com/ticket/10531

Landing pull request 553. Fallback to elem.style for disconnected nodes in width/height retrieval. Fixes #8388.

More Details:
 - https://github.com/jquery/jquery/pull/553
 - http://bugs.jquery.com/ticket/10254
 - http://bugs.jquery.com/ticket/8388

More Details:
 - https://github.com/jquery/jquery/pull/560
 - http://bugs.jquery.com/ticket/10553

Leave the opacity test unanchored in case of floating point rounding browser errors; small fix in queue tests. Fixes #5145.

commit af3fd32f207ed080084f10d76f89c07c414baa05
Merge: 83c08ffa fdd60f8
Author: Dave Methvin <dave.methvin@gmail.com>
Date:   Tue Oct 11 21:17:56 2011 -0400

    Merge branch 'stop' of https://github.com/gnarf37/jquery into pull-541-stop

commit fdd60f8705e98430df62196f505cb929b2d7f6bc
Author: Corey Frang <gnarf@gnarf.net>
Date:   Mon Oct 10 13:51:59 2011 -0500

    .stop( [queue,] clearQueue, gotoEnd )

Thanks to Christian C. Salvadó for the unit tests!

Removes isPending and introduces state as a means to retrieve the Deferred/Promise state. Unit tests amended.

In the event refactor, I tried to have the focus/blur events trigger the focus/blur plus focusin/focusout events but this doesn't handle various real-world cases that expect a trigger()ed jQuery handler to run and be able to pass data even if the native event shouldn't fire.

This reopens a bug that causes a double-fire of
inline event handlers.

These were deprecated several versions ago and have always been undocumented. Use jQuery.proxy() and jQuery.guid instead.