added ag.fillArc() and ag.fillCircle() and associated documentation

git-svn-id: svn://anubis/anaglym/trunk@275 99a6e188-d820-4881-8870-2d33a10e2619

tests/managed_objects.lua

@@ -78,4 +78,6 @@ function update_overlay_event(width, height)
     if (pt_x >= 0 and pt_y >= 0) then
         ag.drawCircle(0, 1, 0, pt_x, pt_y, 5)
     end
+    ag.fillArc(1, 1, 0, 50, 50, 30, 30, 330)
+    ag.fillCircle(1, 0, 1, width - 50, height - 50, 40)
 end