order of panel items : position of each object is update by layering engine (area)

git-svn-id: http://tint2.googlecode.com/svn/trunk@547 121b4492-b84c-0410-8b4c-0d4edfb3f3cc

src/util/area.h

@@ -89,9 +89,9 @@ typedef struct {
 } Area;
 
 
-
+void rendering(void *panel);
 void size_by_content (Area *a);
-void size_by_layout (Area *a);
+void size_by_layout (Area *a, int pos, int level);
 // draw background and foreground
 void refresh (Area *a);