Update surface.attach and change surface.map to surface.map_toplevel

The new map_toplevel() request no longer specifies a position and takes
the size from the attached buffer.  The attach request now takes a
position relative to the top-left corner of the old buffer to let
clients specify the relative position of the new buffer.
diff --git a/clients/resizor.c b/clients/resizor.c
index d5baf17..f308983 100644
--- a/clients/resizor.c
+++ b/clients/resizor.c
@@ -162,8 +162,7 @@
 		return resizor;
 	memset(resizor, 0, sizeof *resizor);
 
-	resizor->window = window_create(display, "Wayland Resizor",
-				     100, 100, 500, 400);
+	resizor->window = window_create(display, "Wayland Resizor", 500, 400);
 	resizor->display = display;
 
 	window_set_key_handler(resizor->window, key_handler);