Merge in data_nocollide branch. Fixes #6968, improves unit testing framework checks...

diff --cc src/event.js
Simple merge

diff --cc src/manipulation.js
Simple merge

diff --cc test/unit/ajax.js
Simple merge

diff --cc test/unit/core.js
index 88f7609,6231b1d..8e57edf
--- 1/test/unit/core.js
--- 2/test/unit/core.js
+++ b/test/unit/core.js
@@@ -85,10 -85,8 +85,16 @@@ test("jQuery()", function() 
        exec = true;
        elem.click();
  
+       // manually clean up detached elements
+       elem.remove();
++
 +      for ( var i = 0; i < 3; ++i ) {
 +              elem = jQuery("<input type='text' value='TEST' />");
 +      }
 +      equals( elem[0].defaultValue, "TEST", "Ensure cached nodes are cloned properly (Bug #6655)" );
++
++      // manually clean up detached elements
++      elem.remove();
  });
  
  test("selector state", function() {

diff --cc test/unit/css.js
Simple merge

diff --cc test/unit/event.js
Simple merge

diff --cc test/unit/manipulation.js
Simple merge