Incorrect xfce_framebox_add() implementation

[Jeff Franks]

Brain,

Another thing I've noticed about XfceFramebox is that I have no way of 
setting the frame text or indent without duplicating the entire code 
block in xfce_framebox_new(). I can provide a patch if you like that 
would make 'indent' a property, provide a text getter and setter and add 
the xfce_real_framebox_add() function (making XfceFramebox language 
binding friendly :-) ).

Jeff.