Merge: Removed useless `buffered_ropes` package

Since the package was experimental and did not bring anything but woes to the maintainer of the `text` package, I'd suggest we remove it

Pull-Request: #1882
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>