[jQuery] Adding xhtml+xml capabitlity to ajax load()

[Max_B]

Currently, the load() method uses the responseText from the ajax
request and innerHTML. If the server send application/xhtml+xml
content-type header the responseXML is returned by the ajax/get/post
method but is not inserted into the DOM.

One needs to manually add it in the callback with a code like:
function (data, status) {
        if (data.documentElement)
targetnode.appendChild(document.importNode(data.documentElement,
true));
        else targetnode.append(data);
}

I just posted an enhancement request to the trac system but I post it
there for reference and request for comments.