TODO - 2008-01-25
-----------------

	- Add access methods and make node structure opaque.
	  -- To allow for C++ migration
	  -- To make future binary compatibility easier
	- Add C++ class/struct.
	  -- Make this the core implementation which the C API accesses?
	  -- Class would allow for subclassing, is that necessary?
	- Binary XML support???
	- mxmldoc
DONE	  -- --css filename option
DONE	  -- First paragraph is description
DONE	  -- Remaining is "Discussion"
DONE	  -- Add element for write_description().
DONE	  -- Add write_function() with base heading level, add for methods.
	  -- --framed filename option (filename-toc.html,
	     filename-body.html, filename.html)
	  -- Add link/constant markup a la Doxygen for description text.
	    --- @code foo@ for <code>foo</code>
	    --- @link name@ for <a href='#name'>name</a>