jquery core: closes #2811, $.fn.add now calls $.unique internally, also it was failing for array-like f.e: window.

$.inArray now makes a === check because of IE.
$.inArray is used in $.fn.index, this is shorter, and breaks the loop when possible.
$.fn.index can receive a jquery object, and the first element is used

test runner: making 2 tests more flexible because they yield a slightly different result on Safari 3, but still acceptable.

jquery ajax: support for dynamic data arguments, see #2806; added test/data/echoQuery.php for easier testing of sent query strings

test runner: translated all the ok() with '==' to equals(), as it gives more information on failures.

jquery testrunner: reset global events after each run, speeds up a test run for ajax from 16s to 10s (test/?ajax), kudos to Ariel

cached some vars and it proved to be faster.

- removed some needless if's
- replace multiple "var x" for one, comma separated declaration.
- added a local fn called now() for the (new Date)s
- fixed the indentation of a block, and a typo in a comment.
- used fn instead of prototype where possible
- jquery fx: exposed the speeds hash as jQuery.fx.speeds.

Also fixed (again) line endings

jquery event: from #2249, adding $.event.proxy to link event handlers, and implementing it on $.event.add, $.fn._toggle and $.fn.one.
It also fixes a bug in $.fn.one that was unbinding ALL the existing handlers.

jquery core: in $.makeArray, improved array-like detection, Safari reports nodelists as 'function', so I got back to attribute sniffing.