2.5

View3D four-split: added box-clip for the three ortho
windows. Is all on by default, waiting for headers and
buttons to come back.

Also: hotkey for foursplit now also removes it (toggle)

Also: window_to_3d() function only did delta's, 
renamed it to window_to_3d_delta  and coded a 
real window_to_3d()

source/blender/editors/transform/transform_generics.c

@@ -1081,7 +1081,7 @@ void calculateCenter(TransInfo *t)
 
 	if(t->spacetype==SPACE_VIEW3D)
 	{
-		/* initgrabz() defines a factor for perspective depth correction, used in window_to_3d() */
+		/* initgrabz() defines a factor for perspective depth correction, used in window_to_3d_delta() */
 		if(t->flag & (T_EDIT|T_POSE)) {
 			Object *ob= t->obedit?t->obedit:t->poseobj;
 			float vec[3];