Undoing 'undo' fix 12365, it didn't work the same on mac's, Ton would like to fix the bug himself.

Tree From Curve,
- report error when nurbs or poly curves are used.
- don't throw errors when >4 branch's per segment are used. also try deal with this better. though no nice solution exists.
- default speed is 10x slower then before.

source/blender/python/api2_2x/Blender.c

@@ -637,7 +637,7 @@ static PyObject *Blender_Load( PyObject * self, PyObject * args )
 		 * enough here.  Note: the default file requires extra clean-up done by
 		 * BIF_read_homefile: freeing the user theme data. */
 		if( !fname || ( strstr( fname, ".B.blend" ) && is_blend_file ) )
-			BIF_read_homefile(0, 1);
+			BIF_read_homefile(0);
 		else
 			BIF_read_file( fname );