[datafeed, cw.xml] xml now carry entity's source information, interpreted at the other end so that for instance when an entity from elo is seen when importing cwo, it's properly marked as coming from elo source if one exists

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<div id="ajaxroot">

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  <div class="ajaxHtmlHead">

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    <script src="http://foo.js" type="text/javascript"> </script>

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    <link rel="stylesheet" type="text/css" media="all" href="qunit.css" />

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  </div>

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  <h1>Hello</h1>

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</div>