Drupal.ajax.insert can only insert the HTML once.

This patch allows the replaceWith ajax command to work with multiple elements but breaks all effects because the new_content variable is no longer the object that is actually in the dom tree

This patch fixes the effects and behaviours integrations broken by the last patch. The key portion of the patch is the following.

    // Add the new content to the DOM.
    // jQuery will only allow an object to be added to the DOM tree once so,
    // to maintain functionality with behaviours and effects, we explicitly
    // clone and store a copy of new_content for each replacement.
    var new_elements = [];
    wrapper.each(function() {
      var new_element = new_content.clone();
      $(this)[method](new_element);
      new_elements[] = new_element;
    });

I did this this way as although some of the methods return the newly added jQuery objects, replaceWith returns the dom objects that were removed instead. This meant that something like var new_elements = wrapper[method](new_content.prop('outerHTML')); was not going to work with behaviors and effects consistently.

This patch undoes the white space fixes that should not be included in this patch and makes sure that the new_element gets added to the list of new elements.