2007-10-06  Hans Breuer  <hans@breuer.org>

	* lib/arrows.c : major restructuring - getting calculate and draw by
	function pointer. A lot of arrows are converted to the new style thus
	arrow_bbox() can give the correct bounding box.
	* objects/standard/arc.c : bug #340705 and bug #477569
	  objects/standard/bezier.c : bug #300055 
	  objects/standard/line.c objects/standard/polyline.c 
	  objects/standard/zigzagline.c : not using *BBExtra to adjust the 
	bounding box for arrows but instead a combination of arrow_bbox()
	and calculate_arrow_point() 
	* lib/bounding_box.c : just a comment for now
	* samples/arrows.dia : more coverage


svn path=/trunk/; revision=3800