XHTML Renderer should not compact TEXTAREA and some other XHTML elements

http://www.w3.org/TR/xhtml1/#C_3 says:
"Given an empty instance of an element whose content model is not EMPTY (for example, an empty title or paragraph) do not use the minimized form (e.g. use <p> </p> and not <p />)."

Right now we compact all elements.