Added Doxygen support.
Added Doxygen support.

Signed-off-by: Jonas Juselius <26f26109c6d6ed614ebb910d34eccad3fd81d79f@uit.no>

dftlibs/xcfun,robertodr/xcfun,bast/xcfun,robertodr/xcfun,robertodr/xcfun,robertodr/xcfun,bast/xcfun,dftlibs/xcfun,bast/xcfun,dftlibs/xcfun,dftlibs/xcfun,bast/xcfun