- add initial version of line stipple renderer

- 'vbo' moved to 'Layers'

src/org/oscim/renderer/MapTile.java

@@ -37,15 +37,6 @@ public final class MapTile extends JobTile {
 	 */
 	public boolean isVisible;
 
-	/**
-	 * VBO holds all vertex data to draw lines and polygons when
-	 * 'layers' are compiled. layout:
-	 * 16 bytes fill coordinates,
-	 * n bytes polygon vertices,
-	 * m bytes lines vertices
-	 */
-	BufferObject vbo;
-
 	/**
 	 * Pointer to access relatives in QuadTree
 	 */