Add outerposition property to figure objects. * graphics.h.in (figure::properties::outerposition): New property. (figure::properties::position): Make with 's' flag. (figure::properties::set_position): Explicit definition with additional input argument for toolkit notification. (figure::properties::set_outerposition): New method. (figure::properties::set_boundingbox): New arguments for inner/outer bounding box and toolkit notification. (figure::properties::init): Add constraint for outerposition. * graphics.cc (figure::properties::get_boundingbox): Returns position or outerposition, depending on internal flag. (figure::properties::set_boundingbox): New input arguments for inner/outer position and toolkit notification. (figure::properties::set_position): New input argument for toolkit noticiation. (figure::properties::set_outerposition): New method.