Clicking "Back" from Flickr (any app) doesn't navigate correctly if DT is installed in a subdirectory

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In AppCommon.js, the closeApp() function sets the document.location = "/" on line 18. This works fine if Droptiles is installed in the root. But, when I run it in my local dev environment, it uses a url such as "localhost:6643/Droptiles/". I tested by making an install directory variable ("/Droptiles") and using that instead of "/" and it worked.